A heavy stone is lowered on the ground The work done is positive or negative Explain answer briefly - Science - Work and Energy

Question

A heavy stone is lowered on the ground The work done is positive
or negative
Explain answer briefly

Rahul Verma · Accepted Answer

work done will be negative
work done (W)=Î”E=final energy-initial energy
Î”E is change in energy
let the mass of stone is m and it is at a height h
so the potential energy of the stone at height h =mgh
suppose stone is lowered to height h/2
the potential energy of the stone at height h/2 =mgh/2
work done (W)=mgh/2-mgh=-mgh/2
work done is negative when the stone is lowered

A heavy stone is lowered on the ground. The work done is positive or negative. Explain answer briefly.

A heavy stone is lowered on the ground. The work done is positive or negative.

Explain answer briefly.