Question: (a) Imagine holding a ball a certain height above the ground. If you let the ball go, it accelerates downward. An interaction between the ball

(a) Imagine holding a ball a certain height above the ground. If you let the ball go, it accelerates downward. An interaction between the ball and what other object causes this acceleration? Is this interaction attractive or repulsive?

(b) Once the ball hits the ground, its direction of travel reverses. Is this reversal the result of an attractive interaction or a repulsive one?

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