A particle starts from origin t=0 with a velocity 5.0 ^i m/s and moves in x-y plane under action of a force which produces a constant acceleration of (3.0 ^i + 2.0^j) m/s squ.

a) What is the y coordinate of the particle at the instant its x coordinate is 84m?

b)What is the speed of the particle at this time?

Please help! :o

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