physics

A person throws a rock straight up into the air. At the moment it leaves the person's hand it is going 81 mph. When the rock reaches its peak, how fast is it going and what is the magnitude and direction of its acceleration? Ignore air drag. Express your answer using appropriate mks units

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asked by Anonymous
  1. at the peak, it has stopped, so speed=0
    acceleration is just -g, as usual.

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    posted by Steve

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