Question

The formula r=2√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 60 mph?

Answer 1

180 is what I get?

Answer 2

is that right

Answer 3

is the L square? or just the 5?

Answer 4

rooted that is

Answer 5

60 = 2 √5L
L = 30 / √5
= 13.42

I have assumed that its sqroot of 5 only - not sqroot (5L)

Answer 6

should 60 be divided by (2/sqt(5))?

Answer 7

i see yeah that's what I get
but it does seam too short

Answer 8

so not one got that right
Length is 180 feet

Answer 9

problem is that the formula is ambiguous
what about the sqroot question we asked?

Answer 10

if its sqrt of 5L then answer is 180

Answer 11

is that the answer?
if L is sqrt then
sqrt(L)=60/(2sqrt(5)) and then squaring L=180

Answer 12

yes

Answer 13

think that must be right 13.41 seams way too short.

Answer 14

is 180 the answer the book gave?

Answer 15

if so then its sqrt(5L)

Answer 16

agreed