Question

The formula r= 2sqrt5L 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 many feet will a car skid at 70 mph?

Answer 1

\[r=2\sqrt{5L}\]


\[70=2\sqrt{5L}\]


\[\frac{70}{2}=\sqrt{5L}\]


\[35=\sqrt{5L}\]


\[35^2=5L\]


\[1225=5L\]


\[\frac{1225}{5}=L\]


\[245=L\]


\[L=245\]

Answer 2

\[r=2\sqrt{5L}\]

Answer 3

so would the answer be 1225 feet?

Answer 4

answer would be 245 ft

Answer 5

oops