Question

Calculate work done on the body of mass 20kg for lifting it 2 meters above the ground?

Answer 1

First, you don’t specify whether the mass is being lifted or moved horizontally or (unlikely, in a beginning physics course) some other direction. We only count the work if it is converted into potential gravitational energy in a conservative force, which only applies if it goes up (or down). IF your mass is moving horizontally the work is zero.