Physics man 5?

Question

5. Determine the stopping distances for an automobile with an initial speed of 90 km/h and human reaction time of 1.0s: (a) for an acceleration a=-4.0m/s^2; (b) for a=-8.0m/s^2.

Answer 1

t = (v2 - v1) / a

plug in the values and add one second for ur answer