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?

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