Assume that the brakes in your car create a constant deceleration of 4.2 m/s2 regardless of how

Question:

Assume that the brakes in your car create a constant deceleration of 4.2 m/s2 regardless of how fast you are driving. If you double your driving speed from 18 m/s to 36 m/s,
(a) Does the time required to come to a stop increase by a factor of two or a factor of four? Explain. Verify your answer to part (a) by calculating the stopping times for initial speeds of
(b) 18 m/s
(c) 36 m/s.