an easy way to check is to see whether change in momentum for the two bodies are the same. in your case, it is not. please see whether i am correct
final speeds of the bodies are the same as they had before, only they are reversed in direction after collision.ie. 1st body has3.5 along left and 2nd one has 2.1 right.
change in mom for either body is m(vf- vi)=.24(-3.5-3.5)=.40(2.1+2.1)=1.68
avg force=change in mom/ time=1.68/(.01)=168 N.
actually, the initial momentum of the two particle system is coming zero. u missed a negative sign in between.(or maybe your conventions are different)
so final momentum of the two body system will also be zero.(no external force on the two body system, so mom conserved) thus u can easily see that the mag of velocities must remain the same, only directions are altered
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Last edited by r.samanta; Oct 27th 2009 at 12:25 PM.
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