# An object has a mass of #4 kg#. The object's kinetic energy uniformly changes from #48 KJ# to # 320 KJ# over #t in [0, 12 s]#. What is the average speed of the object?

##### 1 Answer

Jan 15, 2017

Average speed is

#### Explanation:

Kinetic energy of an objeect of mass

As the mass of the object is

We have

and as the mass of the object is

Hence average speed is