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A swimmer is doing laps in the pool at a constant speed. When she reaches the end of the pool, she kicks off the wall and swims back down the pool in the opposite direction at the same speed. We know a force acted on the swimmer because she experienced a change in...

Question

A swimmer is doing laps in the pool at a constant speed. When she reaches the end of the pool, she kicks off the wall and swims back down the pool in the opposite direction at the same speed. We know a force acted on the swimmer because she experienced a change in...

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Solution

The swimmer experienced a change in direction. According to Newton's first law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. In this case, the swimmer was moving in one direction, then applied a force (by kicking off the wall) to change direction. This change in direction indicates that a force was applied.

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