Final exam

Question

The stopping distance of a car, taking into account an average reaction time, can be estimated with the formula d=0.05v ^2+1.5, where d is in feet and v is the speed in miles per hour. For each problem, calculate the stopping distance of a car traveling at the given speeds.

 

Part A: 20 miles per hour

Part B: 40 miles per hour

Answer 1

So for these problems you plug in the speed of the car into the equation

 

Part A

v = 20

 

d=.05(20)^2 + 1.5

d= 21.5 feet

 

Part B

v = 40

 

d=.05(40)^2 + 1.5

d=81.5 feet