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 \( 70 \mathrm{~cm} \) on either side of \( A \), its speed at \( A \) must be? (mass of the ball \( 10 \mathrm{~g} \) and take \( \mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^{2} \) ).
(a) \( 3.7 \mathrm{~m} / \mathrm{s} \)
(b) \( 5 \mathrm{~m} / \mathrm{s} \)
(c) \( 4.8 \mathrm{~m} / \mathrm{s} \)
(d) \( 6 \mathrm{~m} / \mathrm{s} \)
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