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A particle describes uniform circular motion in a circle of radius \( 2 \mathrm{~m} \), with the angular speed of \( 2 \mathrm{rad} \mathrm{s}^{-1} \). The magnitude of the change in its velocity in \( \frac{\pi}{2} \mathrm{~s} \) is
(a) \( 0 \mathrm{~m} \mathrm{~s}^{-1} \)
(b) \( 2 \sqrt{2} \mathrm{~m} \mathrm{~s}^{-1} \)
(c) \( 8 \mathrm{~m} \mathrm{~s}^{-1} \)
(d) \( 4 \mathrm{~m} \mathrm{~s}^{-1} \)
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