A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would
A) double as well.
B) decrease by a factor of two.
C) stay the same.
D) quadruple.
E) decrease by a factor of four.

Question

Quizplus · Accepted Answer

The stopping distance is proportional to the square of the initial velocity when deceleration is constant. If the initial velocity is doubled, the stopping distance becomes four times greater.

A Car Traveling with Velocity V Is Decelerated by a Constant