Use the Product Rule to Simplify Square Roots
-The formula $\mathrm { v } = \sqrt { 20 \mathrm {~L} }$ can be used to estimate the speed of a car, $\mathrm { V }$, in miles per hour, based on the length, L, in feet, of its skid marks upon sudden braking on a dry asphalt road. If a car is involved in an accident and its skid marks measure 245 feet, at what estimated speed was the car traveling when it applied its brakes just prior to the accident?
A) 70 miles per hour
B) 75 miles per hour
C) 65 miles per hour
D) 80 miles per hour

Question

Quizplus · Accepted Answer

Using the given formula $v = \sqrt{20L}$ and substituting $L = 245$, we get $v = \sqrt{20 \times 245} = \sqrt{4900} = 70$ miles per hour.

Use the Product Rule to Simplify Square Roots -The Formula v=20 L\mathrm { v } = \sqrt { 20 \mathrm {~L} }v=20 L​

Use the Product Rule to Simplify Square Roots
-The Formula $\mathrm { v } = \sqrt { 20 \mathrm {~L} }$