A boy throws a ball horizontally from the window 500m above the ground in one building so that it enters the window 10m above the ground in the other building. If two buildings are 100m apart, find the horizontal velocity of the ball.
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Answer:
Let the initial vel of ball be v and time taken for its light be t
Then,
Also, in vertical displacement
(10.9−55)=(0)t−
2
g
t
2
[initial vertical component is zero]
⇒
−
−9.8
44.1×2
=t
⇒3s=t
From (i) and (ii)
v(3)=180
v=60 m/s