https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-average-speed-and-average-velocity/v/average-speed-velocity-with-examples 2020-06-23T07:22:41Z Average speed & velocity (with examples) Let's learn what average speed & velocity are using some examples. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/GLrCC8C_Hq_p5p68zARNU98qlEcH8FYkS0Y0wJy04zgGz2GBLu9FMNjdq-miMc_9iEbmXFOeBu57BO9oTNaR8ruo3w Average speed & velocity (with examples) Let's learn what average speed & velocity are using some examples. https://cdn.kastatic.org/ka-youtube-converted/a451lmDKv9w.mp4/a451lmDKv9w.mp4 565 Motion https://www.khanacademy.org/science/in-in-class-11-physics-cbse-hindi/in-in-11-motion-in-a-straight-line-hindi/average-velocity-and-average-speed-hindi/e/average-velocity---speed-multi-motion--no-graph- 2026-03-06T17:50:38.494926415Z Average velocity and speed with direction changes: word problems Practice calculating average velocity and speed from word problems when an object changes directions. Sean Boston exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-average-speed-and-average-velocity/v/average-speed-solved-numerical 2021-04-06T14:32:18Z Average speed for entire journey - solved numerical Let's learn how to calculate average speed when someone covers equal distances in two different speeds. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/dMAx5I6EnR7T4ra2L_b_JLMmXIKu_sRpYIzswu9VyhQlh8_q9ICGl-56XaAJok85itgMcst1Hui6sCiswewzoKY Average speed for entire journey - solved numerical Let's learn how to calculate average speed when someone covers equal distances in two different speeds. https://cdn.kastatic.org/ka-youtube-converted/7tByPWVR3pQ.mp4/7tByPWVR3pQ.mp4 882 Motion https://www.khanacademy.org/science/in-in-class-11-physics-cbse-hindi/in-in-11-motion-in-a-straight-line-hindi/average-velocity-and-average-speed-hindi/e/practice--velocity---speed--without-graphs- 2026-03-06T03:50:42.250138425Z Average velocity and speed in one direction: word problems Practice calculating average velocity and speed from word problems when an object moves in one direction. Sean Boston exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-average-speed-and-average-velocity/v/calculating-average-velocity-or-speed 2021-03-04T17:23:32Z Calculating average velocity or speed Although speed and velocity are often words used interchangeably, in physics, they are distinct concepts. Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. Speed (or rate, r) is a scalar quantity that measures the distance traveled (d) over the change in time (Δt), represented by the equation r = d/Δt. Sal Khan video https://cdn.kastatic.org/googleusercontent/CmHtPHEwXnF8wDsUgu4Eim-belRc6BR7htZFCndG6rNjvxdC7npZpmRBIaBi0qduRNPCTgjYw2E27oKQ-qJ_t24 Calculating average velocity or speed Although speed and velocity are often words used interchangeably, in physics, they are distinct concepts. Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. Speed (or rate, r) is a scalar quantity that measures the distance traveled (d) over the change in time (Δt), represented by the equation r = d/Δt. https://cdn.kastatic.org/ka-youtube-converted/oRKxmXwLvUU.mp4/oRKxmXwLvUU.mp4 705 Motion https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:4th-quarter/x0492729e402f0c6b:universal-laws-of-physics/v/acceleration-in 2024-01-16T04:11:35.384208864Z Acceleration Let's explore what acceleration is and how we calculate it. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Acceleration Let's explore what acceleration is and how we calculate it. https://cdn.kastatic.org/ka-youtube-converted/TAtCs9ifRRY.mp4/TAtCs9ifRRY.mp4 516 Motion https://www.khanacademy.org/science/bridge-course-class-11th-physics/x4c0d503cda725c32:motion/x4c0d503cda725c32:basics-of-motion/e/acceleration 2025-03-07T16:50:49.734868403Z Acceleration Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-position-time-graphs/v/position-time-graphs-class-9 2021-04-06T14:32:19Z Position-time graphs Using animations lets learn what position time graphs are, and how they help us figure out which objects are slower and faster. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/CpQ7Ya2V7QQQ_1PVHBS-BEF5SB4bwTwByGBFfLH9qliprwEMaZ7ETx8MqF3uBK3KPc9KM20YZDMMJRyPIob1mHvGIw Position-time graphs Using animations lets learn what position time graphs are, and how they help us figure out which objects are slower and faster. https://cdn.kastatic.org/ka-youtube-converted/7CHvM-VfoL8.mp4/7CHvM-VfoL8.mp4 716 Motion https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:4th-quarter/x0492729e402f0c6b:universal-laws-of-physics/e/finding-distance-and-displacement-from-position-time-graph-in 2025-04-09T10:12:02.040424533Z Finding distance and displacement from position-time graph Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-position-time-graphs/v/calc-velocity-from-position-time-graphs 2020-06-23T07:22:41Z Calc. velocity from position time graphs Let's learn how to calculate velocities from position-time graphs. We will also get some intuition behind why slope or steepness of position time graphs represent velocity. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/K7jWjPMLDSNmfBZuRWPIksZsAD0OmSelNQHSx8aOP1WCur091H0rxY5-HhKpAeMptHtx94mIitF7i7p_l-MZ9fOC Calc. velocity from position time graphs Let's learn how to calculate velocities from position-time graphs. We will also get some intuition behind why slope or steepness of position time graphs represent velocity. https://cdn.kastatic.org/ka-youtube-converted/7kHOA0o9TzQ.mp4/7kHOA0o9TzQ.mp4 569 Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-velocity-time-graphs/v/velocity-time-graphs-acceleration 2024-05-08T04:27:59.771442451Z Velocity vs. time graphs Let's learn how to calculate accelerations from velocity-time graphs. We will also get some intuition behind why slope or steepness of a velocity-time graph represents acceleration. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Pb79eZ6bm7naG8YXcq97Ot2U01KpZ2pieeIYEU2SGhnK_UpMin0slnTLZn7h3WSHpPmH5Rzq8t3M_de3IU91v8s Velocity vs. time graphs Let's learn how to calculate accelerations from velocity-time graphs. We will also get some intuition behind why slope or steepness of a velocity-time graph represents acceleration. https://cdn.kastatic.org/ka-youtube-converted/b1Zd8hUWpw0.mp4/b1Zd8hUWpw0.mp4 636 Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-velocity-time-graphs/v/calculating-displacement-from-v-t-graphs 2020-06-23T07:22:42Z Calculating displacement from v-t graphs Let's learn how to calculate displacements from v-t graphs. We will see why the area under the v-t graph gives displacement. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/SGJ17XEWTx5U56nQtEdQtaceI3vUU1RMpui6d4mijjMAtX3Ri3cNgzxrzzrq__kEhOlSbq2X2BAFmjds4sGeVqyN Calculating displacement from v-t graphs Let's learn how to calculate displacements from v-t graphs. We will see why the area under the v-t graph gives displacement. https://cdn.kastatic.org/ka-youtube-converted/E-uhIncJmKM.mp4/E-uhIncJmKM.mp4 652 Motion https://www.khanacademy.org/science/bridge-course-class-11th-physics/x4c0d503cda725c32:motion/x4c0d503cda725c32:graphs/e/acceleration-and-displacement-from-v-t-graph 2026-04-08T00:16:02.937952483Z Acceleration and displacement from v-t graph Let's solve some questions vibhor exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-deriving-equations-of-motion/v/deriving-3-equations-of-motion-from-v-t-graph 2020-06-23T07:22:40Z Deriving 3 equations of motion (from v-t graph) Let's derive the three equations of motion using a velocity time graph v = u + at s = ut + 1/2 at^2 v^2 = u^2+2as. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/p-QROu6jZeWhHdUYqrMF3P1WDAFgjjjPifAAgXp1qJ8OyYaugKtKjGQ2nxqRNLnoBei1gVE-cxZeobwYKn4GM8BKWQ Deriving 3 equations of motion (from v-t graph) Let's derive the three equations of motion using a velocity time graph v = u + at s = ut + 1/2 at^2 v^2 = u^2+2as. https://cdn.kastatic.org/ka-youtube-converted/AMhBEPaF7xo.mp4/AMhBEPaF7xo.mp4 785 Motion https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-motion-in-a-straight-line/in-in-class11th-physics-motion-in-a-straight-line-kinematic-formulas/e/1d-kinematics-ap1-conceptual 2025-02-01T10:58:49.272005043Z Choosing the best kinematic equation Practice choosing the best kinematic equation to solve one-dimensional motion word problems.  April Russell exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-motion-in-a-straight-line/in-in-class11th-physics-motion-in-a-straight-line-kinematic-formulas/e/1d-kinematics-exercises-ap1-numerical 2026-03-10T05:00:40.135420241Z Kinematic equations: calculations Practice calculating acceleration, velocity, displacement, and time from word problems using kinematic equations exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-uniform-circular-motion/v/calc-speed-time-in-a-uniform-circular-motion-solved-numerical 2020-06-23T07:22:40Z Calc. speed & time in a uniform circular motion - Solved numerical Let's solve 2 numerical on uniform circular motion. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ardAUICc3zUJCc3lTOm1d08VDOYPD_n3emsVyNO-hEi8VbcCzmxSAkVndVX8O0Uya_1MaykOJy_JGQOoYNeO4Gcxtw Calc. speed & time in a uniform circular motion - Solved numerical Let's solve 2 numerical on uniform circular motion. https://cdn.kastatic.org/ka-youtube-converted/kZ8RqqvM_Dc.mp4/kZ8RqqvM_Dc.mp4 463 Motion https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-motion/in-in-uniform-circular-motion/e/uniform-circular-motion 2026-04-07T22:59:30.107127435Z Uniform circular motion Let's solve some questions! vibhor exercise