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please ASAP!! Suppose that a particle has the following acceleration vector and initial velocity and position...

please ASAP!!

Suppose that a particle has the following acceleration vector and initial velocity and position vectors.

a(t)  =  5 i  +  9t k,    v(0)  =  3 i  −  j,    r(0)  =  j  +  6 k
(a) Find the velocity of the particle at time t.
(b)

Find the position of the particle at time t.
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