Is this right? If you flick two marbles (mass m, speed v), one from each end of a straight line runway, directly at each other at equal speeds would this be an elastic or inelastic collision? I tried to find the kinetic energy and compare and this is what I get: 1/2mv^2 - 1/2mv^2 = 1/2mv^2 - 1/2mv^2 I have no idea if I'm even doing this right. What if you flick 2 from one side and one from the other?

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