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Two points P and Q move in a straight li...

Two points P and Q move in a straight line AB. The point P starts from A in the direction AB with velocity u and acceleration f and at the same time Q starts from b in the direction of BA with velocity `u_(1)` and acceleration `f_(1)`. If they pass one another at the middle point of AB and arrive at the other ends of AB with equal velocities, then `(u+u_(1)) (f-f_(1)) = 8 (fu_(1)-f_(1)u).`

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