Question

18.
A projectile projected with certain angle
reaches ground with
(A) double angle
(B) same angle
greater than 90°
2) angle between 90° and 180°​

Answer 1

A projectile projected with certain angle reaches ground with SAME ANGLE.

Detailed Discussion:

• Let's assume that a projectile has been thrown at an angle $\theta$ with the horizontal with velocity u.

• Now, it will undergo a parabolic trajectory and again land on the same level from which it was projected.

• Considering the symmetric nature of the parabola, we can say that the final velocity vector will still make an angle of $\theta$ with the horizontal.

• This is possible only in case of GROUND-GROUND PROJECTILES, not in other cases.

• See the attached diagram.