Question: A person stands on level ground and throws a baseball straight upward, into the air. (a) Does the person exert a force on the ball

A person stands on level ground and throws a baseball straight upward, into the air. 

(a) Does the person exert a force on the ball while it is in his hand? After it leaves his hand? 

(b) Does the ball ever exert a force on the person? If so, what is the direction of this force? 

(c) If your answer to part (b) is yes, why does the person not accelerate?

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