A balloon is ascending vertically with an acceleration of \( 0.2 \mathrm{~ms}^{-2} \). Two stone...

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A balloon is ascending vertically with an acceleration of \( 0.2 \mathrm{~ms}^{-2} \). Two stones are dropped from it at an interval of \( 2 \mathrm{~s} \). The distance between them when the second stone dropped is (take \( g= \) \( \left.9 \cdot 8 \mathrm{~ms}^{-2}\right) \)
(A) \( 0.4 \mathrm{~m} \)
(B) \( 4.9 \mathrm{~m} \)
(C) \( 19.6 \mathrm{~m} \)
(D) \( 20.0 \mathrm{~m} . \)
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