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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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.