1.

A roller coaster is designed such that ridersece"weightlessness" as they go round the topof a hill whose radius of curvature is 20 m. Thespeed of the car at the top of the hill is between.(g 10 m/s2)(1) 16 m/s and 17 m/s (2) 13 m/s and 14 m/s(3) 14 m/s and 15 m/s (4) 15 m/s and 16 m/s

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