Physics-
General
Easy
Question
A particle 
is projected from the ground with an initial velocity of 
at an angle of 60
with horizontal. From what height 
should an another particle 
be projected horizontally with velocity 
so that both the particles collide in ground at point 
if both are projected simultaneously? 
- 10 m
- 30 m
- 15 m
- 25 m
The correct answer is: 15 m
Horizontal component of velocity of is 10 
or 
which is equal to the velocity of in horizontal direction. They will collide at if time of flight of the particles are equal or 
or 
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