Two particles with masses m and 3m are moving toward each
Chapter 9, Problem 73(choose chapter or problem)
Two particles with masses m and 3m are moving toward each other along the x axis with the same initial speeds vi . The particle with mass m is traveling to the left, and particle with mass 3m is traveling to the right. They undergo a head-on elastic collision, and each rebounds along the same line as it approached. Find the final speeds of the particles
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