Two stones are projected so as to reach the same distance from the point of projection on a horizontal surface. The maximum height reached by one exceeds the other by an amount equal to half the sum of the height attained by them. Then, angle of projection of the stone which attains smaller height is $……..$

For a projectile the ratio of maximum height reached to the square of flight time is

A projectile is thrown upward with a velocity $v_0$ at an angle $\alpha$ to the horizontal. The change in velocity of the projectile when it strikes the same horizontal plane is

The velocity at the maximum height of a projectile is half of its initial velocity $u$. Its range on the horizontal plane is

Choose the correct alternative $(s)$