# If an object with a mass of #10 kg # is moving on a surface at #45 m/s# and slows to a halt after # 4 s#, what is the friction coefficient of the surface?

##### 1 Answer

Jun 6, 2018

#### Answer:

The coefficient of friction is

#### Explanation:

Calculate the acceleration with the equation

The initial velocity is

The final velocity is

The time is

The acceleration is

The mass of the object is

Apply Newton's Second Law to calculate the frictional force

The acceleration due to gravity is

The normal force (reaction) is

The coefficient of friction is