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**Ok here it is: A sports car is advertised to be able to stop in a distance of 50m from a speed of 90 km/h. What is its acceleration in m/s^2?**

I turned 90km/hr into 25m/s but where do I go from there... I'm pretty bad at physics...

Ok I need to know what formula to plug these numbers into. I can't use the acceleration formula because there's no time that can be plugged in. Help please :)

A walkthrough on acceleration would be nice too :)