For part D.
The key is to break the motion into two parts. The first part is during the reaction time. In this time the car moves at constant velocity (it has not began decelerating yet). The second part of the motion is when the person steps on the brakes. In this case you have a constant negative acceleration until the car stops.
Find the distance traveled during each segment and the sum should add to the given 55m.
Label the reaction time with a variable T, and then solve for T in the above equation.
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