Answer
$\frac{3\pi}{32}\ rad/sec$
Work Step by Step
Given $s=\frac{3\pi}{4}\ km, r=2\ km, t=4\ sec$, we have $\omega=\frac{s}{r t}=\frac{\frac{3\pi}{4}}{2\times4}=\frac{3\pi}{32}\ rad/sec$
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