Car B is traveling a distance  d ahead of car A.
Both cars are traveling at 20 m/s when the driver of B suddenly
applies the brakes,causing his car to decelerate at 4 m/s^2 .
it takes the driver of A 0.75 second to react. when driver of A
applies his brakes,he decelerates at 5 m/s^2. determine the distance d
between the cars so as to avoid a collision.



 car A |...............| car B   ..............||
               d

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