In coming to a stop a car leaves skid marks 91m long on the, Ask an Expert

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Q. On a workday the average decibel level of a busy street is 73dB, with 100 cars passing a given point every minute. If number of cars is reduced to 40 every minute on a weekend, what is the decibel level of the street?

Q. In coming to a stop, a car leaves skid marks 91m long on the highway. Assume a deceleration of 7.5m/s2, compute approximately the speed of the car just before braking.

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