Question: A student, crazed by final exams, uses a force P of magnitude 90 N to push a 7.0 kg block across the ceiling of

A student, crazed by final exams, uses a force P of magnitude

A student, crazed by final exams, uses a force P of magnitude 90 N to push a 7.0 kg block across the ceiling of his room, as shown below. If the coefficient of kinetic friction between the block and the ceiling's surface is 0.40, what is the magnitude of the block's acceleration? m/s Enter a number. AP 70

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