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A crate of mass 57 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure...

A crate of mass 57 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure below. If the person pulls with a force of 91 N, what is the crate's acceleration? (Assume that upward is the positive direction. Indicate the direction with the sign of your answer.)

This question was asked on Jan 27, 2013.

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