Question

An elevator motor provides 32kW of power while it lifts the elevator 24 m at a constant speed. If the elevator’s mass is 2200 kg, including the passengers, how long does the motion take?

Answer 1

m * g * h / t = 32 kW ... m * g * h / 32 kW = t ... seconds

Answer 2

Takes time T
change in potential energy = m g h = 2200 * 9.81 * 24 = 518,000 Joules
energy = power * time
518,000 = 32,000 Joules/second * T
T = 16.2 seconds