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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
1) 13 m/s and 14 m/s
2) 14 m/s and 15 m/s
3) 15 m/s and 16 m/s
4) 16 m/s and 17 m/s
2) 14 m/s and 15 m/s