A ball of mass 0.4 kg falls downward, as shown in the diagram above. Initially y

Question

A ball of mass 0.4 kg falls downward, as shown in the diagram above. Initially you observe it to be 3.5 m above the ground. After a short time it is just about to hit the ground.
During this interval how much work was done on the ball by the gravitational force?
W = J

The ball hits the ground and bounces back upwards, as shown in the diagram above. After a short time it is 3.5 m above the ground again.
During this second interval (between leaving the ground and reaching a height of 3.5 m) how much work was done on the ball by the gravitational force?
W = J

Explanation / Answer

A)work done=mgh

=13.72 J

b)work done=-mgh

=-13.72 J

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