Question

A lift of mass 3000 kg moves 100m
upwards at a constant speed in 25s. At
what average rate does the force due to
the cable do work on the lift? [2]​

Answer 1

Answer:

117.6 KW

Explanation:

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Answer 2

The average rate at which the force due to  the cable do work on the lift is 117 kW.

Explanation:

It is given that,

Mass of the lift, m = 3000 kg

Distance travelled, d = 100 m

It moves upwards at a constant speed in 25 s. We need to find the average rate at which the force due to  the cable do work on the lift. It is equal to the work done per unit time as :

$P=\dfrac{W}{t}$

$P=\dfrac{mgd}{t}$

$P=\dfrac{3000\times 9.8\times 100}{25}$

P = 117600 W

or

P = 117 kW

So, the average rate at which the force due to  the cable do work on the lift is 117 kW. Hence, this is the required solution.

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