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
AIPMT 2008, Medium
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$m g=\frac{m v^2}{R} \Rightarrow v=\sqrt{R g}$
$v=\sqrt{20 \times 10}=\sqrt{200}=14.1 m / s$
i.e, . Between $14$ and $15 m / s$.
$v=\sqrt{20 \times 10}=\sqrt{200}=14.1 m / s$
i.e, . Between $14$ and $15 m / s$.
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