Question

A boy of mass 40kg eats bananas contains of 980 joule. If this energy is used to lift him up from ground,the height to which he can climb is

Answer 1

Explanation:

workdone=potential energy

P.E.=mgh

980 =40×9.8×h

980/4×98=h

10/4=h

2.5m=h

Answer 2

The height to which he can climb is 2.45 meters.

Explanation:

Mass of the boy, m = 40 kg

Potential energy of the body, K = 980 J

To find,

The height to which he can climb.

Solution,

When an object reaches to a height, it will posses some potential energy. It is given by :

$K=mgh$

h is the height

$h=\dfrac{K}{mg}$

$h=\dfrac{980\ J}{40\ kg\times 10\ m/s^2}$

h = 2.45 meters

So, the height to which he can climb is 2.45 meters.

Learn more,

Potential energy

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