What average power does a person develop when lifting a 100 kg load to a height of 2 m in 2 s?

Given:

m = 100 kilograms – the mass of the load that the person lifts;

g = 10 m / s2 – free fall acceleration;

h = 2 meters – the height to which the load is lifted;

t = 2 seconds – the period of time during which the load is lifted.

It is required to determine W (Watt) – the power developed by a person.

In order to lift a load, a person must apply a force equal to:

F = m * g.

Then the work of this force will be equal to:

A = F * h = m * g * h.

The power will be equal to:

W = A / t = m * g * h / t = 100 * 10 * 2/2 = 1000 * 2/2 = 1000 watts.

Answer: a person develops a power equal to 1000 watts.