The Attempt at a Solution
I don't want a solution, just guidelines.. I don't really know how to approach it.
I was thinking about an equation of conservation of momentum which will give me 2 equations (x, y) and conservation of energy (because of the ellastic collision) which will give me another equation. All in all - 3 equations, but I have 4 variables: alpha, v0, and the ball and object's speeds after the collision.
What am I missing?
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