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Reynold's Number

Two particles...

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Two particles move horizontally initially with constant acceleration g. At the start, the particles start moving in opposite direction from the same point with velocities 3 m/s and 4 m/s. The distance between the particles when their velocity vectors are perpendicular is \lbrack g is acceleration due togravity\rbrack (1) 1.5m (2) 2 m (3) 3 m (4) 2.4 m

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