A 50 kg box is raised by an elevator system to a position 10 m high.
A) how much work is done on the box?
B) because of friction losses an electric motor must generate a force of 800 N to raise the box. How much work does the motor do while raising the box?
C) if it takes 20 seconds to raise the box what is the power output of the motor?
D) when the box reaches the top it is transferred to a horizontal conveyor which carries the box 20 meters. How much work is done on the box by the horizontal conveyor?

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