(a) Explain by an example what is meant by potential energy. Write down the expression for gravit...

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(a) Explain by an example what is meant by potential energy. Write down the expression for gravitational potential energy of a body of mass m placed at a height h above the surface of the earth.
(b) What is the difference between potential energy and kinetic energy?
(c) A ball of mass 0.5 ย kg slows down from a speed of 5 ย m / s to that of 3 ย m / s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.

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