Physics
posted by Sierra .
The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only onefifth of your weight on the ground. What is the speed of the roller coaster?

apparent weight= 1/5 mg
but apparent weight= weighcentripetalforce
1/5 mg= mgmv^2/r
solve for v
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