A rifle with a muzzle velocity of 100ms^(-1) shots a bullet at a small target 30 m away in the same horizontal line. How much height above the target must the rifle be aimed so that the bullet will hit the target?

A rifle with a muzzle velocity of 100ms^(-1) shots a bullet at a small

1.	A rifle with a muzzle velocity of 100ms^(-1) shots a bullet at a small target 30 m away in the same horizontal line. How much height above the target must the rifle be aimed so that the bullet will hit the target?
Answer» Solution :LET `THETA` is the ANGLE of projection of bullet. Let the rifle bet a tO target at T. As OT is HORIZONTAL range =30m. `implies((u^(2))/g)sin 2 theta=30impliessin 2 theta =0.03` As `sin 2 theta` is SMALL, so take `sin 2 theta =2 theta` `2 theta =0.03impliestheta=0.015`