A rod \( A B \) is shown in figure. End \( A \) of the rod is fixed on the ground. Block is movi...

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A rod \( A B \) is shown in figure. End \( A \) of the rod is fixed on the ground. Block is moving with velocity \( \sqrt{3} \mathrm{~m} / \mathrm{s} \) towards right. The velocity of end \( B \) of rod when rod makes an angle of \( 60^{\circ} \) with the ground is:
(a) \( \sqrt{3} \mathrm{~m} / \mathrm{s} \)
(b) \( 2 \mathrm{~m} / \mathrm{s} \)
(c) \( 2 \sqrt{3} \mathrm{~m} / \mathrm{s}(d) 3 \mathrm{~m} / \mathrm{s} \)
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