019 10.0 points
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 100 m from the crossing
and its speed is 12 m/s.
If the engineer's reaction time is 0.55 s,
what should be the magnitude of the mini-
mum deceleration to avoid an accident?
Answer in units of m/s².