custom bounce physics

Hi, folks! Look like I'm facing another issue. I have a ball with a rigidbody shooting at a triangle. I want it to bounce in a certain direction. For example, if the ball is shot from left to right, once it hits the triangle, I want the ball to go up. On the other hand, when the ball is shot from top to the bottom, if it hits the triangle, it would go left. I have been thinking about this for a while but still can't find the solution. Here is the picture for understanding my condition. !! LINK

Thanks in advance :)