Physics-
General
Easy
Question
After one second the velocity of a projectile makes an angle of 
with the horizontal. After another one second it is travelling horizontally. The magnitude of its initial velocity and angle of projection are 
The correct answer is:
Time of flight of this particle, 
s. if 
is its initial speed and 
is the angle of projection, then
or 
(i)
After 1 s, the velocity vector of particle makes an angle of with horizontal, so
or 
or 
(ii)
Squaring and adding Eqs. (i) and (ii), we have
or 
Dividing Eq. (i) by Eq. (ii), we have
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General
can be written as 
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