An object is projected in the air with initial velocity $u$ at an angle $\theta$. The projectile motion is such that the horizontal range $R$, is maximum. Another object is projected in the air with a horizontal range half of the range of first object. The initial velocity remains same in both the case. The value of the angle of projection, at which the second object is projected, will be $…….$ degree.

The maximum horizontal range of a projectile is $160\, m$. When the projectile is thrown  with the same speed at an elevation of $30^o$ from the horizontal, it will reach to the  maximum height of   ……… $m$

Define projectile motion and projectile particle.

Neglecting the air resistance, the time of flight of a projectile is determined by

The horizontal range is four times the maximum height attained by a projectile. The angle of projection is ……… $^o$