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Q.

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^)ms−1, the time at which it will just have a velocity along the y axis is

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a

15 sec

b

10 sec

c

2 sec

d

Never

answer is B.

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Detailed Solution

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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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^)ms−1, the time at which it will just have a velocity along the y axis is