Question

A 52 kg child on a swing is travelling at 6 m/s . What is his gravitational potential energy if he has 1000 J of the mechanical energy?

Answer 1

The correct answer is "64 J".

Step-by-step explanation:

The given values are:

Mass,

m = 52 kg

Velocity,

v = 6 m/s

Mechanical energy,

= 1000 J

Now,

The gravitational potential energy will be:

⇒
`P.E=1000-(1)/(2)mv^2`

`=1000-(1)/(2)* 52* (6)^2`

`=1000-26* 36`

`=1000-936`

`=64 \ J`