[slickpoppa]

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I need help with this quick problem. For some reason I can't figure it out.

Automobile Airbags: The human body can survive a negative acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250 m/s^2

If you are in an automobile accident with an initial speed of 108 km/h (30 m/s) and are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you for you to survive the crash?

Thanks

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vf^2 - vi^2 = 2ad
a = 250 m/s^2
vf = 0
vi = 30 m/s

so d = (900)/(2*250) = 9/5 m