The distance needed to stop a car is the sum of the breaking distance and the reaction distance. Reaction distance varies directly with speed, and breaking distance varies with the square of the speed. Find the particular equation if at 30kph your reaction distance is 7 m and your breaking distance is 6 m. Find the total stopping distance at a speed of 90kph

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the answer is a if my teacher taught me correct

1.) 21

2.) 0.453

3.) 1.5

4.) 48

5.) $ 22

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