# An object has a mass of #6 kg#. The object's kinetic energy uniformly changes from #540 KJ# to # 36 KJ# over #t in [0, 4 s]#. What is the average speed of the object?

##### 1 Answer

The average speed is

#### Explanation:

The kinetic energy is

mass is

The initial velocity is

The final velocity is

Therefore,

and,

The graph of

The points are

The equation of the line is

So,

We need to calculate the average value of

So,