Pathfinder Magnetism BYU 17

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In a region of space, a uniform electric field of strength E, a uniform magnetic field of induction B and a uniform gravitational field of strength g coexist in mutually perpendicular directions. A charge particle is moving with a uniform velocity in this region. Once the particle leaves this region and begins moving into another region where there is only gravitational field of strength g, its speed begins to decrease. How long after departure from the first region, will the velocity of the particle become minimum ?