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Two balls, one of mass 3kg and moving with a speed of 2m/s and the other of mass 5kg and speed 2m/s, have a head-on collision with one another. What is the speed of the balls after the collision, assuming that it is perfectly inelastic?

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Interesting fact:

From outer space, the sun actually appears white. This is because light isn’t scattered by our atmosphere from that viewpoint.