The formula for the stopping distance in feet is

where
= Speed of the car in miles per hour.
The stopping distance for the car traveling at 15 mph is

The stopping distance for the auto traveling at 15 mph is
.
The stopping distance for the car traveling at 30 mph is

The stopping distance for the auto traveling at 30 mph is
.
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<span>Am primit răspunsul 25016312
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I know the equation is 1/cos
but is it negative sqrt(3)/2 or positive?
or is it negative 1/2 or positive?
This makes the reference angle π/6 or 30º which gives cos 30º=√3/2 or a sec value of 2/√3=2√3/3
sec(-5pi/6)=-2√3/3