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A motorized pulley lifts an object of mass $m$ at a constant velocity $v$.

Assuming that all frictional forces are absent, the average power delivered by the motor is

A

$ \cfrac {mv^2}{2t} $

B

$ \cfrac {mv^2}{t} $

C

$ mgv $

D

$\cfrac{mgv}{2}$

E

$0$

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