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A motorized pulley lifts an object of mass $m$ at a constant acceleration $a = g$.

What is the instantaneous power delivered by the motor at time $t$ (assuming there are no frictional forces)?

A

$\cfrac{mg^2t}{4}$

B

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

C

$ mg^2t $

D

$ 2mg^2t $

E

$ 4mg^2t $

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