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suppose a car is travelling at 20 m/s, and the driver sees a traffic light turn red. After 0.53 s has elapsed (reaction time), the driver applies the brake, and the car decelerates at 7 m/s^2. What is the stopping distance of the car, as measured from the point where the driver first notices the...

A cheetah is hunting a zebra for 3 s at a constant velocity of + 9 m/s. Starting from rest what constnat acceleration must the cheetah maintain in order to run the same distance as the zebra runs in the same time? answer in the book is 6 m/s^2. But when i do my working out i get 3 m/s^2. Is the...