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Finding the angle of a projectile after an inelastic collision and bounce

If a ball is kicked at an angle theta with velocity V, it will follow the projectile parabola (ignoring air resistance). Then when it bounces, the x-and-y components of the velocity are multiplied by the c.o.r. and the root taken to find the magnitude of the resultant velocity. I get that fine, but how does the angle fit in to the equation? What is the effect of the collision on the new starting angle?

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