Question

Determine the kinetic energy of a 100-kg roller coaster car that is moving with a speed of 20.0/ms.

Answer 1

The kinetic energy is 20,000\ J

Explanation:

The kinetic energy of a body is defined as:

`k = (1)/(2)ms ^ 2`

Where m is the mass of the roller coaster car

s is the speed and k is the kinetic energy

We know that
`s = 20\ m/s`

`m = 100\ kg`

Then the kinetic energy of the roller coaster car is:

`k = (1)/(2)(100)(20) ^ 2\\\\k = 50(20) ^ 2\\\\k = 50 * 400\\\\k = 20,000\ J`