A particle is kept at rest at the top of a sphere of diameter \( 42 \mathrm{~m} \). When disturb...

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A particle is kept at rest at the top of a sphere of diameter \( 42 \mathrm{~m} \). When disturbed slightly, it slides down. At what height ' \( h \) ' from the bottom, the particle will leave the sphere
[BHU 2003]
(a) \( 14 \mathrm{~m} \)
(b) \( 28 m \)
(c) \( 35 \mathrm{~m} \)
(d) \( 7 \mathrm{~m} \)
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