Problem F14-9 Dynamics Hibbeler 13th (Chapter 14) Engineering Dynamics - Power and Efficiency

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Principal of work and energy.

If the motor winds in the cable with a constant speed of v = 3 ft/s, determine the power supplied to the motor. The load weighs 100 lb and the efficiency of the motor is epsilon = 0.8. Neglect the mass of the pulleys.
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can u explain again for f(3) = 200 iam sorry till cant understand

aryadwi