When the engineer first sees the car, the locomotive is 100m from the crossing and its speed is 30m/s. if the engineer reaction time is 0.47 s what should the magnitude of the minimum deceleration to avoid an accident?

The deceleration must have the engineer to avoid the accident is

a=-5.238

Explanation:

While the engineer reacts the train continue moving so

Now the final velocity have to be zero so using equation can find deceleration

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

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