A projectile is thrown in the upward direction making an angle of 
with the horizontal with a velocity of 140 
. Then the time after which its velocity makes an angle 
with the horizontal is (Acceleration due to gravity, 
)
Text Solution
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Given, angle of projection, 
and velocity, 
initial velocity.
Horizontal component, 
and Vertical component, 
Suppose after time 
, the inclination of particle with horizontal be 
and at time 
velocity along 
and along 
.
The horizontal component of velocity does not change,
Using 1 st eqn. of motion in vertical direction
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