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Finding change in gravitational potential energy

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A 1.0kg toy car is released at the top of a frictionless track on the left and rolls off of the track from its right side ramp. The car starts at a height of 0.80m, goes through a 0.50m diameter loop, and exits the ramp at a height of 0.25m.
What is the change in the car’s gravitational potential energy from A to B?
Round answer to two significant digits.
  • Your answer should be
  • an exact decimal, like 0.75