For the Force Motion, I set it equal to \mu times Force Weight, and got 11400 for Car A, and 6600 for Car B.
Would I use the final velocity that I calculated for Car A as the velocity in the Kinetic Energy equation?
On a similar problem my teacher posted, he set Force Friction equal to Force Motion. I'm not entirely sure why he did that, and as I can't ask him, I was just going with it.
And sorry, I use S as displacement, which is the same as distance. In my physics class we use different variables.
Homework Statement Car A has a mass of 1900 kg and crashes into parked Car B with a mass of 1100 kg. Car A claims to have hit the brakes 15 metres before crashing into Car B. After the collision, Car A slid an additional 18 metres while pushing Car B 30 metres from its parked position. The...