Kinetic Energy is calculated from:

Ek = ½mv

The **units** of kinetic energy is **joules (J)**.
Ek is a scalar quantity.

There are three variable, Ek, m and v.

Please remember to write your final answers with the correct units.

Example 1

The mass of the car is 1200kg and it is moving at 20m.s

Example 2

The kinetic energy of a car is 300 000J. If the mass is 800kg, calculate its speed.

Example 3

The mass of an electron is 9,1 x 10

Calculate its Ek if it is travelling at 2 x 106m.s

Example 4

A skateboard is moving at 4ms