You are driving to the grocery store at 20m/s. You are 140m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50s and that your car brakes with constant acceleration. What acceleration will stop the car right at the intersection?

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You are driving to the grocery store at 20m/s. You are 140m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50s and that your car brakes with constant acceleration. What acceleration will stop the car right at the intersection?
 
 

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