7.51.Model:Use the particle model for the two blocks. Assume a massless rope, and massless, frictionless pulleys. Visualize:Note that for every meter block 1 moves forward, one meter is provided to block 2. So each rope on 2mhas to be lengthened by one-half meter. Thus the acceleration constraint is 1212.aa=−Solve:Newton’s second law for block 1 is
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