Police can use the length of skid marks on pavement to determine the speed of the vehicle before the brakes were applied in an attempt to stop. A formula has been determined that shows the relationships among the speed of the car in kilometres per hour (s), the coefficient of friction of the road (f), and the length of the skid mark in metres (d). S = square root of 252df a) At the scene of an accident, a dry stretch of pavement has a coefficient of friction of 0.75. The skid mark made by the vehicle was 29 m. How fast was the car travelling? b) Determine the length of the skid mark on the pavement if the coefficient

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