A balloon starts rising from ground from rest with an P upward acce...

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A balloon starts rising from ground from rest with an
P upward acceleration \( 2 \mathrm{~m} / \mathrm{s}^{2} \). Just after \( 1 s \), a stone is

W dropped from it. The time taken by stone to strike the ground is nearly
(1) \( 0.3 \mathrm{~s} \)
(2) \( 0.7 \mathrm{~s} \)
(3) \( 1 \mathrm{~s} \)
(4) \( 1.4 \mathrm{~s} \)
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