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 Feb 3 awarded Student Apr 7 accepted Are there theories that explain wave-particle duality? Mar 30 awarded Commentator Mar 30 revised Are there theories that explain wave-particle duality? added 33 characters in body Mar 30 revised Are there theories that explain wave-particle duality? made more accurate Mar 30 asked Are there theories that explain wave-particle duality? Nov 19 comment Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion Excellent answer. But can I ask why you have subtracted the momenta of the carts? Nov 19 revised Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion minor corrections Nov 19 awarded Scholar Nov 19 accepted Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion Nov 19 comment Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion I understand now! Thanks so much! So are the spikes in the graphs supposed to represent the discontinuity of which you speak? Nov 19 suggested approved edit on Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion Nov 19 comment Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion yes. please note that this is the graph of change in momentum. this is not the graph of velocities, in which case, yes the signs of the velocities would change. Nov 19 comment Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion Please read the question very carefully before accusing me of being unclear. I mentioned twice what the y-axis represents: "the data for the difference in momentum was graphed through the equation m2v2 - m1v1" and "Why are there spikes in the graph of Δp (change in momentum)" implying it's clearly a Δp-t graph. Also please look at the title which clearly states IMPULSE. you missed it three times. Nov 18 asked Analysis of the impulse of 2 colliding carts under the effect of magnetic repulsion Apr 27 awarded Supporter Apr 27 awarded Editor Mar 11 awarded Autobiographer