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## Homework Statement

A train 400 m long is moving on a straight track with a speed of 21.6m/s. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 5.0m/s. Assuming constant acceleration, determine how long the train blocked the crossing. Disregard the width of the crossing.

## Homework Equations

One of the "big four" kinematics equations (velocity, initial velocity, time, acceleration, etc.)

## The Attempt at a Solution

I tried the problem and got 37.04 seconds, but it told me it was incorrect. I am not sure what I did wrong, so can anyone help by telling me what they got and/or how to solve it?