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[" Dewally "],[" 3.A roller coaster is d...

[" Dewally "],[" 3.A roller coaster is designed such that riders "],[" (4) "7" may experiece"weightlessness" as they go round the (Op) "],[" of a hill whose radius of curvature is "20m" .The "],[" speed of the car at the top of the hill is between."],[(9=10m/s^(2))],[[" (1) "16m/s" and "17m/s," (2) "13m/s" and "14m/s],[" (3) "14m/s" and "15m/s," (4) "15m/s" and "16m/s],[" ( "])]

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