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Two identical balls collide one was initially at rest. after the collision one of the balls has a velocity of 3 m/s south. the other has a velocity of 4 m/s west. what was the velocity of the ball that was moving before the collision

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Two identical balls collide head on. The initial velocity of one is 0.75 m/s east, while that of the other one is 0.43 m/s west.

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