A car is going 85 feet per second and the driver puts on the brakes, bringing the car to a stop in 5 seconds.Assume the deceleration of the car is constant while the brakes are on.Suppose a second car is traveling the same speed and the brakes are twice as strong (can stop the car twice as fast)as those in the first car.How far does the second car travel before it stops?
A)Half as far as the first car.
B)Twice as far as the first car.
C)The same distance as the first car.
D)Four times as far as the first car.
E)One-fourth as far as the first car.

Question

Quizplus · Accepted Answer

If the brakes of the second car are twice as strong, it means the car can stop in half the time it takes the first car. Since stopping distance is directly related to the square of the stopping time when deceleration is constant, halving the stopping time quarters the stopping distance.

A Car Is Going 85 Feet Per Second and the Driver