A person standing still on a skateboard decides to jump off quickly. If the velocity of the person in one direction is 4 ft./s, what is the velocity of the skateboard in the other direction? The skateboard weighs 15 pounds and the person weighs 120 pounds

Explanation:

Given:

velocity of the person in one direction,

mass of skate board,

mass fo the person,

Here the case is of elastic collision:

so, the skate will move in the opposite direction.

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