A 5.8 * 104-watt elevator motor can lift a total weight of 2.1 * 104 newtons with a maximum constant speed of

(1) 0.28 m/s

(2) 0.36 m/s

(3) 2.8 m/s

(4) 3.6 m/s

Power is defined as the rate at which work is done upon an object. Like all rate quantities, power is a time-based quantity. Power is related to how fast a job is done. Two identical jobs or tasks can be done at different rates - one slowly or and one rapidly.

P = Fv

Where P is the power

F is the weight

V is the average velocity

V = P/F

V = (5.8 x 10^4 W) / (2.1 x 10^4 N)

V = 2.8 m/s