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Physics (AS & A Level) · May / June 2018 · Paper 13 · Question 16

9702Gravitational potential energy and kinetic energy

A ball is thrown vertically up into the air. It rises to the top of its path before beginning to fall vertically downwards. [diagram: top of path, midpoint of path, starting position] Assume that the gravitational potential energy of the ball is zero at its starting position. Which statement about the ball is not correct?

  1. AAs it rises, its kinetic energy is transferred to gravitational potential energy.
  2. BAt the midpoint of its path, its gravitational potential energy is equal to its initial kinetic energy.
  3. CAt the top of its path, its kinetic energy is zero.
  4. DAt the top of its path, its total energy is less than its initial total energy.

As printed in the paper

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Correct answer: B. At the midpoint of its path, its gravitational potential energy is equal to its initial kinetic energy.

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