# Answer on Mechanics | Relativity Question for Richo

Question #8221

A car moving at 100 km / hour, crashed into a concrete wall that doesn't move. How much time it takes to stop the car and how much its acceleration?

nb: I think this question isn't exhaustive/complete, but maybe you have another ideas. :)

nb: I think this question isn't exhaustive/complete, but maybe you have another ideas. :)

Expert's answer

V=Vo+at

0=Vo+at => Vo=-at. And t=0, so a=-infinity

0=Vo+at => Vo=-at. And t=0, so a=-infinity

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## Comments

Richo06.04.2012 23:42Why the t=0?

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