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The force of contact between the bottoms of some roller-coaster riders and their seats vanishes just...

The force of contact between the bottoms of some roller-coaster riders and their seats vanishes just at the moment the are at the top of a loop, with radius 18.0m. What is the speed of the roller coaster at the bottom of this loop if there is no friction with the track?

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Answer #1

considering forces at the top

m v^2 / r = mg

v^2 / 18 = 9.8

v = 13.282 m/s

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Comment before rate in case any doubt, will reply for sure.. goodluck

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