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October 27th, 2009, 01:58 PM   #1
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A problem about speed and distance

A car traveling at 45 miles per hour is brought to a stop, at constant deceleration, 198 feet from where the brakes are applied. (Give your answers correct to the nearest whole number.)
(a) How far has the car moved when its speed has been reduced to 30 miles per hour?
___ ft

(b) How far has the car moved when its speed has been reduced to 15 miles per hour?
___ft



From here i understand that

turn 45 mi into feet so i get 23760 ft
30miles = 158400ft
15miles= 79200ft

V^2= Vo^2 +2a [delta (s)]
V^2= (0) + 2(23760ft) (198ft)
V=3067

so insted of the 23760 do i plug in 15 miles(turned into feet) and 30miles?
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