An elevator has a mass of 904 kg and carries a maximum load of 709 kg. A constant frictional force of 3120 N retards its motion upward. What must be the minimum power delivered by the motor to lift the elevator at a constant speed of 3.57 m/s? The acceleration due to gravity is 9.8 m/s^2. Answer in units of W.

Wouldn't the answer be 0 W because it is at a constant velocity?

Question

An elevator has a mass of 904 kg and carries a maximum load of 709 kg. A constant frictional force of 3120 N retards its motion upward. What must be the minimum power delivered by the motor to lift the elevator at a constant speed of 3.57 m/s? The acceleration due to gravity is 9.8 m/s^2. Answer in units of W. 

Wouldn't the answer be 0 W because it is at a constant velocity?

anonymous · Answer

Oh nevermind. Just found the answer.