Physics-
General
Easy
Question
A stone dropped from a balloon which is at a height 
reaches the ground after 
second. From the same balloon, if two stones are thrown, one upwards and the other downwards, with the same velocity 
and they reach the ground after 
second respectively, then
The correct answer is:
From equation of motion, we have
Where, is initial velocity, 
the acceleration due to gravity and the time.
For upward motion
for downward motion
multiplying Eq. (i) by 
and Eq. (ii) by 
and subtracting Eq. (ii) by Eq. (i), we get
When stone is dropped from rest 
reaches the ground in second.
Equating Eqs. (iii) and (iv), we get
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