# Physics

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A body of mass 3 kg experiences a force F=(2i +2j) N. If its initial velocity v=( -8i + 4j) m/s, then the time at which it will have a velocity just along the y-axis is ? (The expressions contain vector notations above them)

• Physics -

A = F/m
A = (2/3) i + (2/3) j

V = Vi + A t
V = -8 i + 4 j +(2/3)t i +(2/3)t j

when is Vx = 0 ?
when -8 i + (2/3) t i = 0
(2/3) t = 8
t = 12 seconds

• Physics -

Thankyou :)

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