How Fast Was the Car Going Before It Hit the SUV?

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To determine the speed of the car before it collided with the SUV, the problem involves calculating the initial velocity using the principles of momentum and friction. The combined mass of the locked vehicles is 3220 kg, and they slide 2.8 meters after the impact. The coefficient of friction is 0.8, which allows for calculating the deceleration due to friction. By applying the work-energy principle and the equations of motion, the initial speed of the car can be derived. Further calculations and formulas are needed to arrive at the final answer.
Ckoskie
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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.
 
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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.
 
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Ckoskie,

What have you figured out so far, and what formulas that you know you can apply??
 
http://www.phy.olemiss.edu/~jgladden/phys213/hw05_ch_07.pdf
What is this?
 
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