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 1500 kg. The cars locked bumpers during the collision and slid to a stop with brakes locked on all wheels. Measurements of the skid marks left by the tires showed them to be 7.15 m long. The coefficient of kinetic friction between the tires and the road was 0.65. (a) What was the speed of car A just before the collision? (b) If the speed limit was 35 mph, was car A speeding, and if so, by how many miles per hour was it exceeding the speed limit?
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 1500 kg. The cars locked bumpers during the collision and slid to a stop with brakes locked on all wheels. Measurements of the skid marks left by the tires showed them to be 7.15 m long. The coefficient of kinetic friction between the tires and the road was 0.65. (a) What was the speed of car A just before the collision? (b) If the speed limit was 35 mph, was car A speeding, and if so, by how many miles per hour was it exceeding the speed limit?
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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
1500 kg. The cars locked bumpers during the collision and slid to a stop
with brakes locked on all wheels. Measurements of the skid marks left
by the tires showed them to be 7.15 m long. The coefficient of kinetic
friction between the tires and the road was 0.65. (a) What was the speed
of car A just before the collision? (b) If the speed limit was 35 mph, was
car A speeding, and if so, by how many miles per hour was it exceeding
the speed limit?
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