The collision only robs the ball of vertical momentum. Since the normal
force is (by definition) vertical, it cannot change the ball's
horizontal momentum. Any horizontal change comes from friction or
conversion to rotational energy, which doesn't exist in a particle
system anyway.
--
David Fontaine <dav### [at] faricy net> ICQ 55354965
My raytracing gallery: http://davidf.faricy.net/
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