# If a #13 kg# object moving at #400 m/s# slows down to a halt after moving #20 m#, what is the friction coefficient of the surface that the object was moving over?

##### 1 Answer

Mar 31, 2018

#### Answer:

The coefficient of friction is

#### Explanation:

Apply the equation of motion to find the acceleration

The initial velocity is

The final velocity is

The distance is

The acceleration is

The mass of the object is

According to Newton's Second Law of Motion

The force of friction is

The acceleration due to gravity is

The normal reaction is

The coefficient of kinetic friction is