Q. A roller coaster is designed such that riders experience “weightlessness” as they go round the top of a hill whose radius of curvature is $20\ m$. The speed of the car at the top of the hill is between
A) $16\ m/s\ $and$\ 17\ m/s$
B) $13\ m/s\ $and$\ 14\ m/s$
C) $14\ m/s\ $and$\ 15\ m/s$
D) $15\ m/s\ $and$\ 16\ m/s$
Explanation
The correct answer is Option C: $14\ m/s\ $and$\ 15\ m/s$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.