Posted by **John** on Tuesday, January 21, 2014 at 2:55pm.

A 33.4 kg child, with a 3.05 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the force (positive up/negative down) on the sidewalk from the child when the child is (a) standing still and (b) in the air. Now find the net force (positive up/negative down) on Earth due to the child when the child is (c) standing still and (d) in the air.

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