# Work-Kinetic Energy Theorem

1. Nov 19, 2013

1. The problem statement, all variables and given/known data
A 2.1x103 kg car starts from rest at the top of a driveway that is cooped at an angle of 20.0° with the horizontal. An average friction force of 4.0 x 103 N impedes the car's motion so that the car's speed at the bottom of the driveway is 3.8 m/s. What is the length of the driveway.

2. Relevant equations
Wnet = KE

In other words: Work = m1v1/2 - m2v2/2

Work = force x distance

3. The attempt at a solution

Please give me some work along with the answer so I can understand how to complete the problem.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 19, 2013

### tiny-tim

Show us what you've tried and where you're stuck, and then we'll know how to help!

3. Nov 19, 2013

That's the thing, I really don't know how to start...

4. Nov 19, 2013

### tiny-tim

5. Nov 19, 2013

Would it be d = -0.2625 ? Since it's frictional force I put -4.0x10^3

6. Nov 20, 2013

### tiny-tim

(just got up :zzz:)