Assuming equal rates of acceleration in both cases,how much further would you travel if braking from 56 mi/h to rest than from 28 mi/h?
A)4 times farther
B)3.2 times farther
C)4.8 times farther
D)5.2 times farther

Question

Quizplus · Accepted Answer

The distance traveled during braking is directly proportional to the square of the initial speed. This means that if the initial speed is doubled, the distance traveled during braking will be four times greater. 
Therefore, since 56 mi/h is twice 28 mi/h, the distance traveled during braking from 56 mi/h to rest will be 4 times farther than from 28 mi/h to rest. 
Hence, the answer is A) 4 times farther.

Assuming Equal Rates of Acceleration in Both Cases,how Much Further