How can I check if a ball is moving towards my paddle in an Arkanoid-Like game?

I am programming an arkanoid-like game and would like to give the paddle a magnetic power-up that attracts the ball every time the ball is moving towards it, but then still allows the ball to bounce and to move away from the paddle itself after collision.

In order to do this I think I would need to check somehow whether the balls are moving away or towards the paddle, or at least whether they are moving closer or further the point -12 of the y axis.