How fast was the drunk going just before the collision


A drunk driver in a 2100 kg car plows into a 1400 kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 25 m before stopping. If the effective coefficient of friction is 0.74, how fast was the drunk going just before the collision?

 

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Physics: How fast was the drunk going just before the collision
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