A roller coaster is designed such that ridersexperience -œweightlesness- as they go round the top of ahill whose radius of curvature is 20 mThe speed of thecar at the top of the hill is between: [2008]

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A roller coaster is designed such that ridersexperience -œweightlesness- as they go round the top of ahill whose radius of curvature is 20 mThe speed of thecar at the top of the hill is between: [2008]






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