Two projectiles are fired from the same point in the same plane at angles 23° and 67°. Which of the two projectiles falls at far distance?

Both the projectiles will reach the ground at the same point.
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#6 {main}</pre> respectively, then what is the trajectory of one projectile seen from the second projectile?


The trajectory of the projectile as seen from the second projectile is a straight line.

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Two projectiles are fired from the same point in the same plane at angles 23° and 67°. Which of the two projectiles reaches the ground earlier?


The projectile which is inclined at a lesser angle will reach the ground earlier. 

That is, the body which is projected at angle 23° will reach the ground first. 
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Two projectiles are projected at angles θ and (90°–θ) with same speed. What is the ratio of their time of flight?

Time of flight is given by
So ratio of time of flight =  

                                    


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How does the horizontal component and vertical component of velocity of horizontal projectile change with the time?

The horizontal component of velocity remains constant while vertical component of velocity increases with the time. 
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