Question

.A roller coaster travels at a rate of 50m/s down a hill.
The mass of the coaster is 1000kg. What is the coaster's
KE when it hits the bottom of the hill?

Answer 1

Zero

Explanation

they can only be kinetic energy when the body is in motion.The body was travelling at a rate of 50m/s but however, kinetic energy became Zero upon hitting the bottom of the hill

Answer 2

Answer:

1250000J

Explanation:

Given parameters:

Mass of coaster  = 1000kg

Velocity  = 50m/s

Unknown:

K.E at the bottom of the hill  = ?

Solution:

The kinetic energy of a body is the energy due to the motion of the body. It is expressed as;

     K.E  = $\frac{1}{2}$ m v²

m is the mass

v is the velocity

At the bottom of the hill, the kinetic energy is at its maximum.

So, insert the parameters and solve;

        K.E  =  $\frac{1}{2}$  x 1000 x 50²  = 1250000J