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-----Original Message-----
From: John S. Denker [mailto:jsd@MONMOUTH.COM]
Sent: Wednesday, February 06, 2002 1:31 PM
[snip]
Specifically: The physics changes when the compliance of the
wall becomes small compared to the compliance of the ball.
[snip]
The 'reasoning' goes like this (I____________________________________________
believe). During the push
there MUST be some deformation of the wall. That
deformation may be very
small, but then the forces are very large. Energy
is stored in the deformed
wall BUT came from the person. As the wall rebounds
there is a force
(perhaps quite large) that acts through a
displacement (perhaps quite small)
that will account for the change in KE of the
person. In the end analysis,
the energy does come from the person, but was
temporarily stored in the
wall. There will also be dissipative losses, but we
can imagine those being
minimized.