An elevator car has a mass of 1600 kg and is carrying passengers having a combined mass of 200 kg. A constant friction force of 4000 N retards its motion upward, as shown in Figure 7(a). (A) What power delivered by the motor is required to lift the elevator car at a constant speed of 3.0 m/s? (B) What power must the motor deliver at the instant the speed of the elevator is v if the motor is designed to provide the elevator car with an upward acceleration of 1.0 m/s²? Motor AT Mg Fig. 7: (a) The motor exerts an upward force T on the Elevator car. (b) The free-body diagram for the elevator car.

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