\textbf{164-} The magnitude of motion (momentum) of a body with mass 2 kg is $6\,\dfrac{\text{kg}\cdot\text{m}}{\text{s}}$. What is the kinetic energy of the body in joules?
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(1) $3$ \hspace{2cm} (2) $6$ \hspace{2cm} (3) $9$ \hspace{2cm} (4) $12$
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