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\( \mathrm{P}, \mathrm{Q} \) and \( \mathrm{R} \) are three balloons ascending with
\( \mathrm{P} \) velocities \( U, 4 \mathrm{U} \) and \( 8 \mathrm{U} \) respectively. If stones of

W the same mass \& same height, be dropped from each, when they are at the same height, then
(1) They reach the ground at the same time
(2) Stone from \( P \) reaches the ground first
(3) Stone from \( R \) reaches the ground first
(4) Stone from \( Q \) reaches the ground first
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