A girl holds a stone in her hand and can move it up or
Chapter , Problem 20(choose chapter or problem)
A girl holds a stone in her hand and can move it up or down or keep it still. True or false: (a) The force exerted by her hand on the rock is always the same magnitude as the force of gravity on the stone. (b) The force exerted by her hand on the rock is the reaction force to the force of gravity on the stone. (c) The force exerted by her hand on the stone is always the same magnitude as the force on her hand by the stone, but in the opposite direction. (d) If the girl moves her hand down at a constant speed, then her upward force on the stone is less than the force of gravity on the stone. (e) If the girl moves her hand downward but slows the stone to rest, then the force of the stone on the girls hand is the same magnitude as the force of gravity on the stone.
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