Physics Conservation of Energy
posted by Casey .
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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