A boy throws a ball into air at 
from the horizontal to land it on a roof of a building of height 
. If the ball attains maximum height in 2 s and lands on the building in 3 s after launch, then value of 
is 
m. 
Text Solution
Verified by ExpertsThe correct answer is:
A
For projectile motion at 
, vertical component of initial velocity:
Maximum height occurs at 
when 
:
Thus 
, so 
Height at landing time 
:
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