What is the speed of the automobile after 1.22 s have elapsed?
Mariah asked:
Traveling at a speed of 13.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of the automobile after 1.22 s have elapsed? Ignore the effects of air resistance.
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Traveling at a speed of 13.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of the automobile after 1.22 s have elapsed? Ignore the effects of air resistance.
March 27th, 2010 at 9:54 am
retardation of automobile due to brakes a = - uk g = - 0.65 x 9.8 = - 6.37 m/sec^2
so that its speed after a given time is V = u + a t = 13.3 - 6.7 x1.22 = 5.5 m/sec (nearly) knr