A 645-kg elevator starts from rest and reaches its cruising speed of 1.28 m/s after 3.13 seconds. It moved 2.75 m during that time. (a) What average power (W) is delivered by the motor during the initial acceleration of the elevator during the first 3.13 seconds? (b) How much power (W) is delivered by the elevator motor while the elevator moves upward now at its cruising speed?
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