Answer to Question #8221 in Mechanics | Relativity for Richo
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. :)
V=Vo+at 0=Vo+at => Vo=-at. And t=0, so a=-infinity