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A rope tied to a body is pulled, causing the body to

Chapter 3, Problem 3DQ

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QUESTION:

A rope tied to a body is pulled, causing the body to accelerate. But according to Newton’s third law, the body pulls back on the rope with a force of equal magnitude and opposite direction. Is the total work done then zero? If so, how can the body’s kinetic energy change? Explain.

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QUESTION:

A rope tied to a body is pulled, causing the body to accelerate. But according to Newton’s third law, the body pulls back on the rope with a force of equal magnitude and opposite direction. Is the total work done then zero? If so, how can the body’s kinetic energy change? Explain.

ANSWER:

Solution 3DQ Step 1: If work is done on a system, the kinetic energy of the system will change. In this case, a rope is tied to a body and it is pulled. So, the body will exert a same force opposite to the direction o

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