- #1

garcia1

- 27

- 0

## Homework Statement

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 250 m from the crossing

and its speed is 12 m/s.

If the engineer’s reaction time is 0.36 s,

what should be the magnitude of the mini-

mum deceleration to avoid an accident?

Answer in units of m/s2.

## Homework Equations

I used the kinematics equation x = Vot + 1/2at^2 to find my answer.

## The Attempt at a Solution

By solving for a, I got the answer 3791.358 m/s^2. This was wrong, and I'm also confused as to whether it should be a positive or negative answer.