14-51 Kinetics of a Particle: Work and Energy | Chapter 14: Hibbeler Dynamics | Engineers Academy

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Chapter 14: Kinetics of a Particle : Work and Energy
POWER AND EFFICIENCY
Hibbeler Dynamics 14th ed

14–51. The 1000-lb elevator is hoisted by the pulley system and motor M. If the motor exerts a constant force of 500 lb on the cable, determine the power that must be supplied to the motor at the instant the load has been hoisted s = 15 ft starting from rest. The motor has an efficiency of e = 0.65.

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Hey, i am getting lost at the kinematic equation part 3:55.

gagemccullough