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

Question

Quizplus · Accepted Answer

The stopping distance is proportional to the square of the initial speed. Therefore, if the speed is doubled from $28 \mathrm{mi/h}$ to $56 \mathrm{mi/h}$, the stopping distance will be $2^2 = 4$ times greater.

Assuming Equal Rates of Uniform Acceleration in Both Cases, How 56mi/h56 \mathrm { mi } / \mathrm { h }56mi/h

Assuming Equal Rates of Uniform Acceleration in Both Cases, How $56 \mathrm { mi } / \mathrm { h }$