Q. A rod of mass m and length l can rotate freely around the fixed pivot point A (see picture attached) and is initially at an angle θ = 60 degrees with the vertical direction. The rod swings under the effect of gravity and its end point hits a point-like mass m (equal to that of the rod) initially at rest. Compute the maximum angle of oscillation of the rod after the collision a) if the collision is elastic b) if the collision is completely inelastic ie. if the particle sticks to the rod.
Don't know where to start with this one. Any help would be very much appreciated.