Question

A body of mass 5 kg is taken from a height 5 m to 10 m. Find the increase in its potential energy (g=10 m/s)

Answer 1

potential energy = mgh
where , m is mass of body
h is height of body .

now, potential energy at height = 5m
$P_i=mgh_i=5\times10\times5=250J$
and potential energy at height = 10m
$P_f=mgh_f =5\times10\times10=500J$

now, change in potential energy = increases in potential = final potential energy - initial potential energy
$= P_f-P_i\\=500J-250J=250J$

Answer 2

U=mgh
here m=5kg , g=10m/s, h=10-5=5m
so U=5×10×5=250 watt