# An object has a mass of #6 kg#. The object's kinetic energy uniformly changes from #120 KJ# to # 72 KJ# over #t in [0, 4 s]#. What is the average speed of the object?

##### 1 Answer

Jan 28, 2017

Average speed is

#### Explanation:

As one Joule is equal to

As kinetic energy

and initial velocity is

and final velocity is

and average speed is