A10 kg block is attached to a light cord that is wrapped around the pulley of an electric motor, as shown above. at what rate is the motor doing work when it is pulling the block upward with an instantaneous speed of 3 m/s and an upward acceleration of 2 m/s2 ?

60J/s

Explanation:

The rate at which work is done is known as power.

Given;

Mass = 10kg

Speed = 3m/s

acceleration = 2 m/s2

The rate at which work is done

= work/time

= force × distance/time  but distance/time = speed

= force × speed

= Mass × acceleration × speed

= 10 × 3 × 2

= 60J/s

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