A ball mass m falls from height h and collides elastically with a frictionless inclined plane; the plane is a 45 degree angle with the horizontal. The first spot it collides with is p1 and then it bounces and collides with the plane again at p2. I think the ball bounce off the inclined plane at p1 in such a way that the velocity is parallel to the horizontal but this based on the diagram. So if someone could confirm this that would be much help This is a 4 part problem. The first part I find at what speed the ball collides with the plane at p1. The next one and one I can’t figure out is how much time passes between p1 and p2. The next one is the distance between p1 and p2. I just found the horizontal length between p1 and p2 and divided by the velocity in part 1 because I think just after the collision all of the velocity was directed on the in the x direction. The last part is finding out the velocity of the ball at p2. The way I did this was I found out the vertical distance between p1 and p2 then found the gravitation potential energy between the two points and then set that equal to kinetic energy and found the velocity form need for them to be equal. Then I used Pythagorean Theorem to with legs being the velocity I found to the hypotenuse being the resultant vector.