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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

stone from P reaches the ground first

B

stone from Q reaches the ground first

C

stone from R reaches the ground first

D

all reach at same time

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The correct Answer is:
A
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