A ball is moving to and fro about the lowest point \( A \) of a smooth hemispherical bowl. If it...

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A ball is moving to and fro about the lowest point \( A \) of a smooth hemispherical bowl. If it is able to rise up to a height of \( 20 \mathrm{~cm} \) on either side of \( A \), its speed at \( A \) must be (Take \( g=10 \) \( \mathrm{m} / \mathrm{s}^{2} \), mass of the body \( 5 \mathrm{~g} \) )
[JIPMER 2000]
(a) \( 0.2 \mathrm{~m} / \mathrm{s} \)
(b) \( 2 \mathrm{~m} / \mathrm{s} \)
(c) \( 4 \mathrm{~m} / \mathrm{s} \)
(d) \( 4.5 \mathrm{~ms}^{-1} \)
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