> Say you got two pendulums (pendula ?) that could record the force of
> an impact - I'm sure in my own mind (which still hurts btw) that if you
> let
> them swing together and hit, each would show half the energy in the
> collision. Which I think is my point. Two cars, two speeds, two momenta
> (ah ha !) but also two objects to share the impact. Reasonable ? All has
> been conserved^H^H^H^H^H^H^H

...transformed. Into heat. Cars crumple. Dennis is right, there is twice
as much energy involved with two cars, but there are TWO cars to wreck
with it. Each takes 1/2 of the double energy so each takes only what it
came with.

Peter

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