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Answer to Question #8221 in Mechanics | Relativity 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. :)
Expert's answer
0=Vo+at => Vo=-at. And t=0, so a=-infinity

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07.04.12, 06:42

Why the t=0?

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