Please Help. How do i go about solving this ???

Question

The distance it takes to stop a car after the brakes are applied depends on the car's speed. This braking distance can be modeled by the equation
B
=
0.05
v
2
B=0.05v2, where
v
v is the speed of the car in mph when the driver steps on the brake, and
B
B is the stopping distance in feet. How fast was the car going when the brakes were applied if the stopping distance was
20
20 feet?

Answer 1

B = 0.05v²

 

v = mph

B = feet

 

Solve for v and get

 

v = √(B/0.05) = √(20B)

 

Plug in the given stopping distance, and be careful with units.  You can finish it from here.