Problema Solution
the formula r=2√(5L)can be used to approximate the speed, r, of a car (in mph)that has left a skid mark of the length L in feet. find the length of a skid mark of a car traveling at 20 mph.
Answer provided by our tutors
step1
r= 2 sqrt ( 5L)
where
r= speed of car
l= length of skid mark
step2
given r= 20 mph
20 = 2 sqrt (5L)
10 = sqrt (5L)
SQAURING BOTH SIDE
1OO = 5L
L = 20 FEET