Explain what is meant by gravitational potential energy and by kinetic energy.
A motion sensor is used to measure the velocity of a ball falling vertically towards the ground, as illustrated in the figure below:
The ball passes through points A and B as it falls. The ball has a mass of 
. The variation with time 
of the velocity 
of the ball as it falls from A to B is shown in the figure below:
Use the figure above to calculate, for the ball falling from A to B,
the displacement,
the acceleration,
the change in kinetic energy.
Show that the work done by the gravitational field on the ball in (b) as it moves from A to B is equal to the change in kinetic energy.
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