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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 20m.The speed of the car at the top of the hill is b/w (a) 16 & 17 m/s (b) 13 & 14 m/s (c) 14&15 m/s (d)15 &16 m/s

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