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From a balloon rising vertically upwards at \( 5 \mathrm{~m} / \mathrm{s} \) a stone is thrown up at \( 10 \mathrm{~m} / \mathrm{s} \) relative to the balloon. Its velocity with respect to ground after \( 2 \mathrm{~s} \) is (assume \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) )
[J \& K CET 2006]
(a) 0
(b) \( 20 \mathrm{~m} / \mathrm{s} \)
(c) \( 10 \mathrm{~m} / \mathrm{s} \)
(d) \( 5 \mathrm{~m} / \mathrm{s} \)
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