A particle is projected horizontally with a speed 
from the top of a tower. After
what time will the velocity of particle be at 
angle from the initial direction of projection? [Let g 
]
A
2 s
B
5 s
C
D
7 s
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
and 
axis be adopted along horizontal and vertically downward direction respectively.
After time 
, velocity in 
-direction 
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