Question

What is the energy possess by an object of mass 7kg at a height of 72m also calculate it's potential energy at a height at three fourth at its total height

Answer 1

energy=mgh
energy=7*10*72
=5040J
(b)

$energy = mgh \\ = 7 \times 10 \times 72 \times \frac{3}{4} \\ = 3780$

Answer 2

( i )at height 72m as the body is not in motion, potential energy is possessed

P.E at the top is  = 7(9.8)(72)

P.E = 4939.2 J

Given,

m = 7kg

g = 9.8

h = $\frac{3}{4}(72)$ = 54 m

( ii ) P.E = mgh

7(9.8)(54)

P.E = 3704.4 J