Homework Help: Pre-Calculus

Posted by Becky on Sunday, February 3, 2013 at 12:28pm.

An Alfa Romeo going at 70 mph requires 169 feet to stop. Assuming that the stopping distance is proportional to the square of velocity, find the stopping distances required by an Alfa Romeo going at 35 mph and at 140 mph (its top speed).

Pre-Calculus - Steve, Sunday, February 3, 2013 at 2:24pm
d = kv^2
169 = k*70^2
k = 169/4900

so, d = 169/4900 v^2
plug in v=35 and 140

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