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 170 m from the crossing and its speed is 18 m/s. If the engineer’s reaction time is 0.23 s, what should be the magnitude of the minimum deceleration to avoid an accident? Answer in units of m/s 2 .

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 170 m from the crossing and its speed is 18 m/s. If the engineer’s reaction time is 0.23 s, what should be the magnitude of the minimum deceleration to avoid an accident? Answer in units of m/s 2 .

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