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A train travelling at 45MPH comes to a stop in 31 feet, experiencing a uniform deceleration.

Inside one of its flat-bed boxcar's is a steel block that sits 9 feet from the front wall of its container.

THE QUESTION

If the load indeed strikes the wall of the car (which I've determined it does), please calculate its speed relative to the train as the moment of impact.

RELEVANT VALUES

- Coefficient of
staticfriction = 0.3- Coefficient of
kineticfriction = 0.25- Initial velocity of the train = 45MPH = 20.1168m/s
- Stopping distance of the train = 31' = 9.4488m
- Block's distance from the forward wall = 9' = 2.7432m

MY WORK SO FAR

I'm half asleep at the moment so I'm not exactly confident about my answers but so far I've determined that if the train had to stop within 31 feet, it's deceleration would be -21.414ms^{-2}. Again, that's probably not even close.

And I'm not really sure where to go from here...

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# Homework Help: Will the train's cargo slam into the front of the boxcar?

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