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Title: If a car is speeding down a road at 40 miles/hour (mph), how long is the stopping distance D40 compa Post by: Science only on Oct 29, 2013 If a car is speeding down a road at 40 miles/hour (mph), how long is the stopping distance D40 compared to the stopping distance D25 if the driver were going at the posted speed limit of 25 mph?
Title: If a car is speeding down a road at 40 miles/hour (mph), how long is the stopping distance D40 compa Post by: padre on Oct 30, 2013 As a function of his speed, v, the stopping distance is given by
d = kv^2 Where k is a constant (function of friction, and other factors that are characteristic of the specific car) So, d(40)/d(25) = (40/25)^2 = 2.56. So, d(40) is 156% longer than d(25). |