You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 45.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 19.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750. How fast (in miles per hour) was car A traveling just before the collision? (This problem uses English units because they would be used in a U.S. legal proceeding.) Number 3.04 mph Incorrect. Pay attention to the sign of the velocities. Car A is initially traveling eastward while car B is initially traveling westward. Therefore their initial velocities can not have the same sign.
You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 45.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 19.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750. How fast (in miles per hour) was car A traveling just before the collision? (This problem uses English units because they would be used in a U.S. legal proceeding.) Number 3.04 mph Incorrect. Pay attention to the sign of the velocities. Car A is initially traveling eastward while car B is initially traveling westward. Therefore their initial velocities can not have the same sign.
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Transcribed Image Text:You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs
1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 45.0 mph. The
cars locked bumpers and slid eastward with their wheels locked for 19.5 ft before stopping. You have
measured the coefficient of kinetic friction between the tires and the pavement to be 0.750. How fast (in
miles per hour) was car A traveling just before the collision? (This problem uses English units because
they would be used in a U.S. legal proceeding.)
Number
3.04
mph
Incorrect.
Pay attention to the sign of the velocities. Car A is initially traveling eastward while
car B is initially traveling westward. Therefore their initial velocities can not have the
same sign.
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