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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

a
15 sec
b
10 sec
c
2 sec
d
Never

detailed solution

Correct option is B

When the body has velocity along y-axis its velocity along the X-axis becomes zero then Vx = 0Vx=ux+axt =ux+fxmt0=6i^−3i^5t⇒3t=30⇒t=10sec

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