A hollow sphere has radius \( 6.4 \mathrm{~m} \). Minimum velocity required by a motor cyclist a...

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A hollow sphere has radius \( 6.4 \mathrm{~m} \). Minimum velocity required by a motor cyclist at bottom to complete the circle will be
[RPET 1997; Similar RPMT 2005]
(a) \( 17.7 \mathrm{~m} / \mathrm{s} \)
(b) \( 10.2 \mathrm{~m} / \mathrm{s} \)
(c) \( 12.4 \mathrm{~m} / \mathrm{s} \)
(d) \( 16.0 \mathrm{~m} / \mathrm{s} \)
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