Physics
posted by Clandestine on .
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 yaxis is ? (The expressions contain vector notations above them)

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 
Thankyou :)