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A particle is moving in x-y plane. Its i...

A particle is moving in x-y plane. Its initial velocity and acceleration are `u=(4 hati+8 hatj) m//s and a=(2 hati-4 hatj) m//s^2.` Find
(a) the time when the particle will cross the x-axis.
(b) x-coordinate of particle at this instant.
(c) velocity of the particle at this instant.
Initial coordinates of particle are `(4m,10m).`

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