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

1250000J

Step-by-step 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 =
`(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 =
`(1)/(2)` x 1000 x 50² = 1250000J