A child with a weight of 120 N swings on a playground swing attached to 2.20...

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A child with a weight of 120 N swings on a playground swing attached to 2.20 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest position at the following times? (a) when the chains are horizontal J (b) when the chains make an angle of 26.0 with respect to the vertical J (c) when the child is at his lowest position J Supporting Materials While leaning out a window that is 5.7 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 (PE - PE) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity = W A child with a weight of 120 N swings on a playground swing attached to 2.20 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest position at the following times? (a) when the chains are horizontal J (b) when the chains make an angle of 26.0 with respect to the vertical J (c) when the child is at his lowest position J Supporting Materials While leaning out a window that is 5.7 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 (PE - PE) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity = W