A car is able to stop in a distance d. Assuming the same braking force (and therefore the same acceleration), what distance does this car require to stop when it is traveling twice as fast?
A) d
B) 2d
C) $\sqrt { 2 }$ d
D) 4d
E) 2 $\sqrt { 2 }$ d

Question

Quizplus · Accepted Answer

The braking distance is directly proportional to the square of the velocity. Therefore, if the velocity is doubled, the braking distance is quadrupled. So, the distance required to stop when the car is traveling twice as fast will be 4d.

A Car Is Able to Stop in a Distance D 2\sqrt { 2 }2​

A Car Is Able to Stop in a Distance D $\sqrt { 2 }$