Question

The stopping distance (d meters) of a car is directly proportional to the square of its speed (s km/h) when the brakes are applied. A car travelling at 50 km/h requires a stopping distance of 20 meters. If the stopping distance is 51.2 meters, what is the speed of the car when the brakes are applied?

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

the stopping distance of an automobile is directly proportional to the square of its speed v. a car required 90 feet to stop when its speed was 70 miles per hour. find a mathematical model that gives the stopping distance d in terms of its speed v.