Tracking Ball velocity in local space?

I have a cube player object and 3 ball objects.
every ball has a different velocity.
how can i detect which ball is towards my player?
I used: GameObject.FindGameObjectsWithTag(“Ball”) to put all the ball objects in an array.
how can i know which ones are towards me? tnx…
(sorry about my horrible english)
=]

You could track ‘you’ and the balls in world space, find the distances between ‘you’ and each ball, and keep track of those over time. The ones where lastDistance > currentDistance are moving toward you.