Ball-1 is dropped from the top of a building from rest. At the same moment, ball-2 is thrown upward towards ball1 with a speed 
from a point 
below the top of building. How far will the ball-1 have dropped when it passes ball-2. (Assume acceleration due to gravity, 
.)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For downward motion of ball-1
For upward motion of ball-2,
Given, speed of ball-2, 
, acceleration due to gravity, 
Substituting these values, we get
Adding Eq. (i) and (ii), we get
From Eq. (i), we get
Therefore, the ball-1 will have dropped 
when it passes ball-2.
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