Question

A package of 20.0 lb is dragged by friction 15.0 feet up along a moving surface...

A package of 20.0 lb is dragged by friction 15.0 feet up along a moving surface of conveyor belt inclined at angle of 36.9 degrees above horizontal
if the package's speed is a constant 1.0 in/s, how much work is done on the package by:

a) by friction

b)gravity, and

c) The normal force of the conveyor belt?

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