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Originally Posted by flappist
FFS
You really dont get it at all.
This would be true if you were still doing 20km/h AFTER the impact.
YOU ARE NOT.
YOU HAVE STOPPED
AT THE INSTANT OF THE IMPACT YOU ARE STOPPED AND ALL YOUR ENERGY HAS BEEN ABSORBED.
YOU DO NOT CONTINUE ON AFTER THE IMPACT.....
AFTER THE IMPACT THE BALL IS GOING 20km/h SLOWER so that is all the enery it has lost that must be absorbed by me.
Because the ball and I are unequal it will not balance and I would not stop.
If it were 2 balls then each would absorb half the total force.
You are getting confused by thinking of unequal objects. The mass and velocity must be the same or after the impact they will not be stopped, they will contine moving.
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Have another read of the first line of what I wrote in point 4.
You and I can argue this till we're both blue in the face and I still don't think we'll agree...
(There are some convenient over-sights in what I've written if you apply that line then go and re-read the previous points. Where I was trying to get you to though was point 4.).