Question

A roller coaster train with a mass of 500 kg stops at the top of a hill. If the hill is 110 m high, what is the potential energy of the train?

4,900 J
5,612 J
55,000 J
539,000 J

Answer 1

Answer:

Mass of roller coaster train , m = 500 kg .

Height of hill , h = 110 m .

To Find :

The potential energy of the train .

Solution :

We know , potential energy of an object of mass m at height h is given by :

U=mghU=mgh

Here , g=9.8\ m/s^2g=9.8 m/s

2

.

Putting all value in above equation , we get :

\begin{gathered}U=500\times 9.8\times 110\ J\\\\U=539000\ J\\\\U=539\ kJ\end{gathered}

U=500×9.8×110 J

U=539000 J

U=539 kJ

The potential energy of the train is 539 kJ .

or 539000 J