Recent content by Qedpower

I think I've got it. So there are two forces. The downward motion that is helped by gravity and the car's velocity (call it f1) and the average friction (4000). I will be using the formula distance=1/2at^2. I need to find another meaning for the time and acceleration. So f1= mg cos 20 degrees so...

I have figured out that mg=average frictionxdistance, is this right?

So have I left out gravity? What do you mean when you said that no angle should be involved?

Homework Statement A 2.1x10^3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20 degrees with the horizontal. An average friction force of 4x10^3 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...