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A box weighing 200 N is dragged up an incline 10 m long and 3 m...

A box weighing 200 N is dragged up an incline 10 m long and 3 m high. Afterwards is left at rest. The average force (parallel to the incline) is 120 N. a) How much work is done? b) What is the change in the potential energy of the box? In its kinetic energy? c) What is the frictional force on the.box?

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