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An engineer in a locomotive sees a car stuck on the track at a railroad crossing in front of the train. When the engineer first...Asked by Anonymous
an engineer in a locomotive sees a car stuck in the track at a railroad crossing in front of the train. when the engineer first sees the car, the locomotive is 160 m from the crossing and its speed is 29m/s. if the engineer’s reaction time is 0.66 s, what should be the magnitude of the minimum deceleration to avoid an accident?
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Answered by
oobleck
a = -29/t where it takes t seconds to stop
so, t = -29/a
Now use that t value to find a in the equation
29t + 1/2 at^2 = 160
so, t = -29/a
Now use that t value to find a in the equation
29t + 1/2 at^2 = 160
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