The formula $s = k \sqrt { d }$ relates the speed $s$ (in mph)of a car and the distance $d$ of the skid when a driver hits the brakes. How far will a car skid if it is going 48 mph on dry pavement? On dry pavement, $k = 5.34$ .
A)about 59 ft
B)about 76 ft
C)about 99 ft
D)about 81 ft
E)about 70 ft

Question

Quizplus · Accepted Answer

To find the distance $d$, we rearrange the formula to $d = \left(\frac{s}{k}\right)^2$. Substituting $s = 48$ mph and $k = 5.34$, we get $d = \left(\frac{48}{5.34}\right)^2 \approx 81$ ft.

The Formula s=kds = k \sqrt { d }s=kd​ Relates the Speed

The Formula $s = k \sqrt { d }$ Relates the Speed