# If a #2 kg# object moving at #80 m/s# slows to a halt after moving #4 m#, what is the coefficient of kinetic friction of the surface that the object was moving over?

##### 1 Answer

Nov 5, 2017

#### Answer:

The coefficient of kinetic friction is

#### Explanation:

Apply the equation of motion

to determine the acceleration

The initial speed is

The final speed is

The distance is

The acceleration is

The frictional force is

Let the acceleration due to gravity be

The normal force is

The coefficient of kinetic friction is