Question 691134: If it takes 144ft to stop a car going 60mph, how many feet does it take to stop a car going 45mph?
Answer by pmatei(79)   (Show Source):
You can put this solution on YOUR website! Because you do not know how long it takes to stop the car going 60mph, you need to use this equation:
where  ,  , and 
0 = 100,362,240,000 ft^2/hr^2 + (288 ft)a
a = - (100,362,240,000 ft^2/hr^2)/(288 ft) = 348480000 ft/hr^2
For the second car assume the same acceleration that you just calculated, but this time  and you calculate d:
0 = 56,453,760,000 ft^2/hr^2 - (696960000 ft/hr^2)d
d = (56,453,760,000 ft^2/hr^2)/(696960000 ft/hr^2) = 81 ft
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