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A 20-gram ball is sliding on a frictionless, horizontal surface with an unknown southward velocity when it elastically collides with a 20-gram ball that is

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A 20-gram ball is sliding on a frictionless, horizontal surface with an unknown southward velocity when it elastically collides with a 20-gram ball that is at rest. After the collision, the velocity of one of the balls is 2.00 m/s [S35W]. What was the initial speed of the moving ball before the collision? Ans: 344 \"\"3

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