Question

A ball of 75 g initial at rest, is dropped from rest from certain height and reaches a speed of 19 m/s just before it hits the ground. The work done by the force of gravity on the ball is ??

Answer #1

Work done is equal to change in potential energy

Also as the ball drops it will loses height and hence it loses gravitational potential energy. Loss in gravitational potential energy is equal to gain in kinetic energy as per energy conservation.

Since initial kinetic energy is zero ( ball start at rest) so

work done by force of gravity (W)= final kinetic energy (KE)

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