In an elastic collision of particles, one particle is stationary and another one is moving to the particle at speed u. After colliding, particle 1 and 2 moves at two different velocity, say v1 and v2. Why is the angle between v1 and v2 must be 90 degrees if the resulting particles and the initial particles all have the same mass?

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A: Mass of A train (Ma) = 5.7 g Mass of B train (Mb) = 9.3 g Initial velocity of A train (Va) = 4.5 m/s…

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