PhysicsA body with mass 5kg is acted upon by a force f=(−3i^+4j^)N. If its initial velocity at t=0, v=(6i^−12j^)ms−1, the time at which it will just have a velocity along the y axis is

A body with mass 5kg is acted upon by a force f=(3i^+4j^)N. If its initial velocity at t=0, v=(6i^12j^)ms1, the time at which it will just have a velocity along the y axis is

  1. A

    15 sec

  2. B

    10 sec

  3. C

    2 sec

  4. D

    Never

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    Solution:

    When the body has velocity along y-axis its velocity along the X-axis becomes zero then Vx = 0

    Vx=ux+axt =ux+Fxmt0=6i^3i^5t3t=30t=10sec

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