2. Consider the following statement made by a student about each of the four mot

Question

2. Consider the following statement made by a student about each of the four motions in problem The magnitude of the force exerted by the block on an individual string is the same as the magnitude of the force exerted by that string on the block. They are a third law force pair. So I don't understand why the block doesn't move at constant speed if that is true. The student has correctly identified a Newton's third law (action-reaction) force pair. Explain why this does not mean that the block must move at constant speed

Explanation / Answer

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the statement of third law is correct

the string exert force on block so there will be acceleration in block (FM=a)

therefore block velocity increases with time hence it do not move with constant velocity

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