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A particle moves in such a way that its $x$ and $y$ coordinates are given by $x(t) = -2\cos3t$ and $y(t) = 2 \sin 3t$. What is the magnitude of the acceleration at $t = 2 s$?

A

$2 m/s^2$

B

$3 m/s^2$

C

$6 m/s^2$

D

$12 m/s^2$

E

$18 m/s^2$

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