Pulley on the edge of a table

Question

1. You again have a 25kg block (A) resting on a frictionless table; a cord attached to the block extends horizontally to a pulley at the edge of the table. A 7 kg mass (B) hangs at the end of the cord. 
2. If block A travels 0.5 meters, what is the velocity at that location?
3. If the hanging mass block B is able to move a total of 1.2 meters before touching the floor, how long is mass A going to be accelerating?
4. What happens to block A once block B touches the ground? State any assumptions you made here explicitly.

Answer 1