Question

The formula r=2sqrt(5L) can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 20 mph?

Answer 1

\[20 = 2 \sqrt{5L}\]\[10 = \sqrt {5L}\]\[10^{2} = 5L\]\[L = 100/5 = 20\]

Answer 2

So how many feet is it? 100/5?

Answer 3

transform 20 mi into feet

20 mi = 105 600 feet

Answer 4

okay, what do i do next?

Answer 5

that's yur answer..

Answer 6

105 600 feet is my answer?

Answer 7

a car that has left skid marks of length L, in feet. How far will a car skid at 20 mph?

-> 20 mi = 105 600 feet

Answer 8

Ok, thank you.

Answer 9

np

Answer 10

what about at 80mph