# If a #3 kg# object moving at #5 m/s# slows to a halt after moving #10 m#, what is the coefficient of kinetic friction of the surface that the object was moving over?

##### 1 Answer

#### Answer:

#### Explanation:

I will show you 2 different methods to do this question :

**Method 1 - Using Newton's Laws and equations of motion**

The acceleration of the object may be found from the equations of motion for constant linear acceleration as follows :

This acceleration is caused by the resultant force of friction acting on the object and by Newton 2 given as :

**Method 2 - Using energy considerations**

From conservation of energy, work done by friction equals change in kinetic energy brought about.