You are called as an expert witness in the trial of a traffic violation. The fac

Question

You are called as an expert witness in the trial of a traffic violation. The facts are these: A driver slammed on his brakes and came to a stop with constant acceleration. Measurements of his tires and the skid marks on the pavement indicate that he locked his car's wheels, the car traveled 192 ftbefore stopping, and the coefficient of kinetic friction between the road and his tires was 0.750. The charge is that he was speeding in a 45 mi/hzone. He pleads innocent.

A.What is your conclusion, guilty or innocent?

B.How fast was he going when he hit his brakes?

Explanation / Answer

v^2 = u^2 -2ad

=> u =sqrt(2*(mu*g)*d)

=> u = sqrt(2*9.8*0.75*192) = 53.1262646908287728 ft/sec = 0.681818182*53.1262646908287728 = 36.2224532079516659437870496 mi/hr

He is innocent!

b) 36.2224532079516659437870496 mi/hr

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