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You are driving at 15.0 m/s on a straight horizontal road. You are 20.0 meters away...

You are driving at 15.0 m/s on a straight horizontal road. You are 20.0 meters away from the traffic light when it turns yellow. You take 0.4 s to start applying the brake (it is your reaction time). Once the brake is applied it stops uniformly at the stop point. (a) What is the acceleration of the car during the time the brake was applied? (b) How much total time it takes to stop?

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