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A 8.5-kg box is being lifted by means of a light rope that is threaded through...

A 8.5-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling.

(a) If the box is being lifted at a constant speed of 2.0 m/s, what is the power delivered by the person pulling on the rope?


(b) If the box is lifted, at constant acceleration, from rest on the floor to a height of 1.3 m above the floor in 0.42 s, what average power is delivered by the person pulling on the rope?

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Answer #1

mg PARTLいね1.2 hX3 473 m/sec +2 (0.42) final velocity, = JRxax-h ヲ、RX14-73x13 2. 162173 J eyneo the box affen Thans hore, te a

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