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every time i try to answer this i get t=.2s and a=-1651ms^-2

the problem reads....

A car traveling at 25mi/h is to stop on a 35m-long shoulder of the road. (a) What is the required magnitude of he minimum acceleration? (b)How much time will elapse during this minimum deaceleration untll the car stops.

i used the equation....

a=v^2/2x

:grumpy: