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Class 11 Physics (India)

Course: Class 11 Physics (India) > Unit 6

Lesson 5: Kinematic formulas

Choosing the best kinematic equation

A watermelon is dropped from the top of a 80, start text, m, end text tall building. We want to find the velocity of the watermelon after it falls for 1, point, 35, start text, s, end text. The watermelon has not yet hit the ground.

Which kinematic formula would be most useful to solve for the target unknown?

Assume the positive direction is upward and air resistance is negligible.

(Choice A)
v, equals, v, start subscript, 0, end subscript, plus, a, t
(Choice B)

delta, y, equals, v, start subscript, 0, end subscript, t, plus, start fraction, 1, divided by, 2, end fraction, a, t, squared
(Choice C)
delta, y, equals, left parenthesis, start fraction, v, start subscript, 0, end subscript, plus, v, divided by, 2, end fraction, right parenthesis, t
(Choice D)

v, squared, equals, v, start subscript, 0, end subscript, squared, plus, 2, a, delta, y

Stuck?

Class 11 Physics (India)

Course: Class 11 Physics (India) > Unit 6

Problem