Question

A car’s speed before a sudden stop can be estimated by the formula

Answer 1

Answer:

S = 30 mph

Step-by-step explanation:

A car’s speed before a sudden stop can be estimated by the formula :

$S=\sqrt{30gk}$

Here,

S = speed of the car in mph,

g = drag factor, and

k = length of skid mark in feet

If drag factor is 1, k = 30 feet

So,

$S=\sqrt{30\times 1\times 30}\\\\S=30\ mph$

Therefore, the correct option is (a) 30 mph.