How can I find magnitude and direction of the velocity of the body (A and B) if

Before

A is in motion and moving to the direction of B
m = 0.5 kg
v = 9.0 m/s

B
m = 2.5 kg


After

A and B are together and constant.

Can you write the whole question... It's a question on types of collision... I'll solve it and give you the steps to each the answer... If it is a homework, try to solve it by yourself. You must put in your own effort. We are not here to do your homework! LOL!