The position vector of a particle is r(t) = (10t- 3t“)i + (6 – t)j + (6t² – 2t)k. Find the acceleration vector at t= 2. O A. a(2)= - 36i + 12k O B. a(2)= 144i+ 12k OC. a(2) = - 144i - j+ 12k O D. a(2) = - 144i + 12k

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