You are called as an expert witness to analyze the following auto accident: Car

Question

You are called as an expert witness to analyze the following auto accident: Car B, of mass 1900 kg , was stopped at a red light when it was hit from behind by car A, of mass 1300 kg. The cars locked bumpers during the collision and slid to a stop. Measurements of the skid marks left by the tires showed them to be 7.35 m long, and inspection of the tire tread revealed that the coefficient of kinetic friction between the tires and the road was 0.650.

What was the speed of car A just before the collision?
By how many mph was car A exceeding the speed limit 35.0 mph?

Explanation / Answer

change in kinetic energy = work

after the collision,

both cars are stuck together and travel at a velocity V,


the force of friction slows the cars down and eventually to a stop

KEf-KEi = -umgd

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