Question

A weight lifter lifts a 100 kg mass from the floor a vertical distance up of 1.90 m and then lets it down again.

a) Find the work done by the weight of the mass up
b) Find the work done by the force exerted while the weightlifter lifts the weight up
c) Find the total work done by the weight up and down.

Answer 1

Answer:

Option 3

Explanation:

Since while lifting it up there is force and displacement work is done

While holding it up you apply force but no displacement so no work is done