Question

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 sees the car, the locomotive is 320 m from the crossing and its speed is 16 m/s.

If the engineer’s reaction time is 0.64 s, what should be the magnitude of the mini- mum deceleration to avoid an accident?

Answer 1

d = 320-16*0.64 = 310 m. = stopping distance.

V^2 = Vo^2+2a*d = 0.
16^2+2a*310 = 0.
a =