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P, Q and R are three balloons ascending ...

P, Q and R are three balloons ascending with velocities U, 4U and 8U respectively. If stones of the same mass be dropped from each, when they are at the same height, then

A

They reach the ground at the same time

B

Stone from P reaches the ground first

C

Stone from R reaches the ground first

D

Stone from Q reaches the ground first

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The correct Answer is:
B
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