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Pinkalicious13:

A student lifts a set of books off a table and places them in the upper shelf of a book case which is 2 meters above the table. If she applies a force of 5 newtons to lift these books, what is the work done? A. 0 joules B. 2.5 joules C. -2.5 joules D. 10 joules E. -10 joules

jason78687:

Use Work=F.SCos@ where @ is angle between applied force and direction of motion

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