Physics Conservation of Energy

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A car traveling at 20 miles/hour stops in a distance of 15 feet when its brakes are locked. Assuming that the frictional force doesn't depend on speed, that same car traveling at 60 miles/hour will stop in a distance closest to

a. 15 feet
b. 45 feet
c. 90 feet
d. 135 feet

My answer: c

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