If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (7 ln(3t))i + (9t3)j
A. a = - 
t-2i + 54tj
B. a = 
t-2i + 54tj
C. a = - 
i + 54tj
D. a = 
i + 27tj
Answer: C
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