Question

21, A body of mass m is moved from ground to a
height h. If force of gravity on mass of 1 kg is g
newton, find : (a) the force needed to lift the body,
(b) the work done in lifting the body and (c) the
potential energy stored in the body.
​

Answer 1

Explanation:

when a body of mass m at A on ground is raised above ground through height h at B force is applied

this force applied = weigt of body force on mass m=F=mg

where g is the force of gravity on a mass of 1kg

b- work done in lifting the body= force × displacement h W=mg×h

c- Potential energy= mgh