# An object has a mass of #9 kg#. The object's kinetic energy uniformly changes from #135 KJ# to # 45 KJ# over #t in [0, 4 s]#. What is the average speed of the object?

##### 1 Answer

Average Speed

#### Explanation:

The given data:

Mass

Kinetic Energy initial

Kinetic Energy final

initial time

final time

Compute for initial velocity

Compute for final velocity

Solve for the total distance traveled by the object using the following:

and

Divide the first equation by the second equation

Average speed

Average speed

Average speed

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