A mass $m$ slips along the wall of a semispherical surface of radius $R$. The velocity at the bottom of the surface is
A mass $m$ slips along the wall of a semispherical surface of radius $R$. The velocity at the bottom of the surface is
- A
$\sqrt {Rg} $
- B
$\sqrt {2Rg} $
- C
$2\sqrt {\pi Rg} $
- D
$\sqrt {\pi Rg} $
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