# While leaning out a window that is 5.8 m above the ground, you drop a 0.60 kg basketball to a friend at ground level. Your friend catches the ball at a height of 1.9 m above the ground. Determine the following. (a) the amount of work done (in J) by the force of gravity on the ball J (b) the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is released J (c) the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is caught J (d) the ratio of the change (PEf − PE0) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity ΔPE W

Question
While leaning out a window that is 5.8 m above the ground, you drop a 0.60 kg basketball to a friend at ground level. Your friend catches the ball at a height of 1.9 m above the ground. Determine the following.
(a)
the amount of work done (in J) by the force of gravity on the ball
J
(b)
the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is released
J
(c)
the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is caught
J
(d)
the ratio of the change (PEfPE0) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity
 ΔPE W

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