# Homework Help: Car and Speed question

1. Oct 22, 2005

### Ckoskie

Okay here is my question I have spent 6 hours on it and I can't get the answer. the Question is:
a 920kg car is driving down the road and hits a 2300kg SUV stopped at a red light. The two cars lock together and their break lock. they then slide forward 2.8m. A police officer know that the coeficient of friction between rubber and pavement is 0.8. Whith this he can figure out the speed at which the car was going when it hit the SUV. Find the speed of the car just before the collision.

I really hope someone can help me.

2. Oct 22, 2005

### Mk

If you don't be careful someone is going to ask what you have figured out so far, and what formulas that you know you can apply.

Last edited: Oct 23, 2005
3. Oct 22, 2005

### Pengwuino

Ckoskie,

What have you figured out so far, and what formulas that you know you can apply??

4. Oct 24, 2005

### Mk

http://www.phy.olemiss.edu/~jgladden/phys213/hw05_ch_07.pdf [Broken]
What is this?

Last edited by a moderator: May 2, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook