On the surface of the earth, you are in the process of throwing a ball straight upward. The ball has a mass of 1 kg and at a given instant, the ball and your hand are accelerating upward at 5 m/s2. What downward force is the ball exerting on your hand? Let the acceleration of gravity be 10 m/s2. 1. 15 N 2. 20 N
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