Kinetic Energy

When something is in motion it is said to have kinetic energy.

For an object that is moving the kinetic energy equals one half times the mass of the object times the square of the speed of the object. In symbols:

E_K = (1/2)mv²

How much kinetic energy does an object have if its mass is 5.0 kg and it is moving at a speed of 4.0 m/s?

E_K = (1/2)mv²	Formula for kinetic energy.
E_K = (1/2)(5.0 kg)(4.0 m/s)²	Plug in values for mass and speed.
E_K = 40 J	Kinetic Energy equals 40 J.

Here are some problems to try using the above equation.