1. A ball is thrown from a point on ground at some angle of projection. At the same time a bird starts from a point directly above the point of projection at a height h horizontally with speed u. Given that in its flight ball just touches the bird at one point, find the distance where the ball strikes...

Ans: 2u underroot 2h/g

 

2. Average velocity of a particle is a projectile motion between its starting point and the highest point of its trajectory is:

 

Ans: u/2  underroot 1 + 3 cos(square) theta...

average velocity =total displacement / total time taken

(v_av )_x = (R/2) / (T/2) = u cos(theta)

(v_av)_y = (H/2) / (T/2) = {u sin(theta) }/2

now v_av =underoot of { ( v_{av x} )^2 + (v _{av y})^2}