- #1

Fazza3_uae

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## Homework Statement

The motor of an elevator generates 12000 Watts of power when moving the elevator at constant speed of 2 m/s.what is the mass of elevator in kg ...??

There are 5 options for the answer.

a) 500 Kg b) 400 Kg c) 300 Kg d) 240 Kg e) 200 Kg

## Homework Equations

P = W/t

## The Attempt at a Solution

I tried to solve it like this ..

Power = Work / Time = Force * Displacement / Time = Force * Velocity = m*a*v

So m = P / a*v

where a is the gravitaional acceleration = 9.8 m/s

^{2}

v is the constant speed = 2 m/s

P is the power = 12,000 Watts

I simply plugged in the numbers & got 612 Kg which is obviously wrong. Any help would be apprecitaed. Thanks