3. [/3 Points] OSCOLPHYS1 7.P.025.WA. Mgaul '26 A child with a weight of 100 N swings on a playground swing attached to 1.90 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 i_]J (b) when the chains make an angle of 35.0 with respect to the vertical i:]1 (c) when the child is at his lowest position i J Supporting Materials . PhySical Constants Submit Answer 4. [/4 Points] OSCOLPHYSZO16 7.3.WA.024. ASK YOUR TEACHER While leaning out a window that is 5.6 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 1.2 m above the ground. Determine the following. (a) the amount of work done (in J) by the force of gravity on the ball i:]J (b) the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is released i3] (c) the gravitational potential energy (in J) of the ball-earth system, relative to the ground when it is caught i:]J (d) the ratio of the change (PEf 7 PEG) in the gravitational potential energy of the ball-earth system to the work done on the ball by the force of gravity