A ball with mass “m” at repose is hit by an other ball with mass “2m”…

A ball with mass “m” at repose is hit by an other ball
with mass “2m” that travels from the right at 1m/s , If after the
collision the ball with mass “2m” continues to move right at 1/3
m/s
a. does it conserve the total lineal momentum? why?
b. Determine velocity (magnitude and direction) of the ball with
mass “m”
c. which type of collision is it?