Projectile again

Classical Mechanics Level 3

Two particles move in a uniform gravitation field with an acceleration $$g$$. At the initial moment the particles were located at one point and moved velocities $$v_1=3.0 \text{ m/s}$$and $$v_2=4.0 \text{ m/s}$$ horizontally in opposite directions. Find the distance between the particles at the moment when their velocity vectors become mutually perpendicular.

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