A red train traveling at 78 km/h and a green traintraveling at 142 km/h are head

Question

A red train traveling at 78 km/h and a green traintraveling at 142 km/h are headed toward one another along astraight, level track. When they are 940 m apart, each engineersees the other's train and applies the brakes. The brakes slow eachtrain at the rate of 1.0 m/s2. A) What is the braking distance for the secondtrain?
A red train traveling at 78 km/h and a green traintraveling at 142 km/h are headed toward one another along astraight, level track. When they are 940 m apart, each engineersees the other's train and applies the brakes. The brakes slow eachtrain at the rate of 1.0 m/s2. A) What is the braking distance for the secondtrain?

Explanation / Answer

green train v1=142km/h /3.6 = 39.4444m/s v2=0 a=-1m/s2 solve for d v22=v12+2ad 0=(39.444m/s)2+2*-1*d d=777.91m for the first train 0=(78/3.6)2+2*-1*d d=234.72m d1+d2=1012m the trains will actually hit each other, so the braking distance isreally irrelivant

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