An elevator car, with a mass of 450 kg is suspended by a single cable. at time = 0s, the elevator car is raised upward. the tension on the cable is constant at 5000n during the first 3 seconds of operation. determine the magnitude of the velocity of the elevator at time = 3 seconds.

33.33 m/s

Explanation:

m = 450 kg. T = 5000 N, t = 3 seconds,

let the net acceleration is a.

T = m a

a = 5000 / 450 = 11.11 m/s^2

u = 0 , v = ?

Let v be the velocity after 3 seconds.

Use first equation of motion

v = u + a t

v = 0 + 11.11 x 3 = 33.33 m/s

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conservation of mass

mass before something happens = mass afterwards