Question

A BOY OF MASS 20 KG CLIMBS UP A ROPE THROUGH A HEIGHT OF 7 METER AND HE TAKES 10 SEC TO DO SO. WHAT IS THE POTENTIAL ENERGY? [G=10M/S^2]

Answer 1

1400 j

Explanation:

PE= mgh

If m=20kg, H=7m, g= 10 m/s

PE= 20*7*10

=1400 j

Answer 2

The potential energy of the boy is 1372 Joules.

Explanation:

It is given that,

Mass of the boy, m = 20 kg

Height at which he reached, h = 7 m

Time taken to reach a height of 7 meters, t = 10 s

We need to find the potential energy. It is said to be possessed by an object by virtue of its position or height above ground. It is given by :

$P=mgh$

$P=20\times 9.8\times 7$

P = 1372 Joules

So, the potential energy of the boy is 1372 Joules. Hence, this is the required solution.

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