Finding velocity of mass A after collision with swinging mass B

[nonaJ]

Homework Statement

Homework Equations

The Attempt at a Solution

I know that the velocity of mass at the bottom of the swing is
V = Sqrt(2gh), but I'm not sure how to get from there to the velocity of A. Is it as simple as Angular momentum of B = Linear Momentum of B?

 

[Doc Al]

I know that the velocity of mass at the bottom of the swing is
V = Sqrt(2gh),

That would be true if the pivot were fixed.

What are your answers to parts a and b? (Those are the keys to solving c.)