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A motor cyclist going round on unbanked ...

A motor cyclist going round on unbanked circular race course has to lean inwards, making an angle `21^(@) 49 `' with the vertical , in order to keep his balance. If the curve is 1 km long , then the speed of the cyclist will be,
`( tan 21^(@) 49 =0.4003' g=9.8 m//s ^(2) )`

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