Question 334290
The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r. If a car traveling 60 mph can stop in 200 ft, how many feet will it take the same car to stop when it's traveling 50 mph?
-------------
d = k/r^2
---
Find "k" using d = 200 when r = 60 mph
200 = k/3600
k = 720000
-------
Equation:
d = 720,000/r^2
---
If r = 50, d = 720,000/50^2 = 1152 ft
===========================================
Cheers,
Stan H.