# An object with a mass of #5 kg# is on a surface with a kinetic friction coefficient of # 4 #. How much force is necessary to accelerate the object horizontally at # 9 m/s^2#?

##### 1 Answer

Mar 29, 2016

#### Answer:

#### Explanation:

Draw a free body diagram, FBD:

x-axis:

Summation of all Forces

y-axis:

Insert (2) into (1):

Now

A word of caution, a kinetic friction,