Initial Velocity of Bowling Ball in Physics Problem

[uvburgos]

A bowling ball with a mass of 7kg collision with a pin in rest with a mass of 2kg, after the collision the pin acquired a velocity of 6m/s and the ball continues with a velocity of 4m/s, both to the front. What was the initial velocity of the ball?

 

[Hootenanny]

A bowling ball with a mass of 7kg collision with a pin in rest with a mass of 2kg, after the collision the pin acquired a velocity of 6m/s and the ball continues with a velocity of 4m/s, both to the front. What was the initial velocity of the ball?

As I've said previously, please show your work.