Homework SourseAccording to Car and Driver an Alfa Romeo going 70 mph requi
According to Car and Driver, an Alfa Romeo going 70 mph requires 177 feet to stop. Assuming that the stopping distance is proportional to the square of the velocity, find the stopping distance required by an Alfa Romeo going at 30 mph and at 120 mph.
At 30 mph, stopping distance =
At 120 mph, stopping distance =
At 30 mph, stopping distance =
At 120 mph, stopping distance =
Solution
You have to find the multiplicating factor first : D = stopping distance V = speed a = factor You can say D = a*V^2 177 = a * 70^2 a = 177 / 4900 a = 0.0361 The formula is : D = 0,0361 * V^2 At 30 mph D = 0,0361 * 30^2 D = 32.51 ft At 135 mph D = 0.0361 * 135^2 D = 658.33 ft
