Question

In 2.66 minutes, a ski lift raises four skiers at constant speed to a height of 138 m. The average mass of each skier is 68.4 kg. What is the average power provided by the tension in the cable pulling the lift?

Answer 1

Concept - The change in kinetic energy will be zero because the speed is constant. Total work done will be equal to change in potential energy plus change and kinetic energy. Divide the work done by time to find the average power as shown below***********************************************************************************************
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