Question

A stone of mass 500 g is thrown vertically upwards with a velocity of 15 metre per second. Calculate the potential energy at the greatest height.

Answer 1

Potential energy = mgh
u=15m/s g=-10
v^2 = u^2 - 2gh
0=225-20h
h=225/20
h=11.25

P.E = 500/1000 x 10 x 11.25
=5 x 11.25= 56.25

Answer 2

u=15 m/s

g=10

v^2=u^2-2gh

0=225-20h

h=225/20

h=11.25

P.E.=500/1000×10×11.25

=5×11.25

=56.25 J

Hope it will help you.....