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A person pulls a box in the sand. The force applied by the person is 40...

A person pulls a box in the sand. The force applied by the person is 40 N in the horizontal direction, and it moves the box at a constant speed ? = 2 m/s.

a. In 4 seconds, how much work is done on the box?

b. What is the rate that energy is supplied to the box?

c. If energy is constantly supplied to the box, why doesn’t the box accelerate?

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