If the velocity of a particle is given by \( v=(180-16 x)^{1 / 2} \...

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If the velocity of a particle is given by \( v=(180-16 x)^{1 / 2} \mathrm{~m} / \mathrm{s} \), then its acceleration will be
\( \mathrm{P} \)
(1) Zero
(2) \( 8 \mathrm{~m} / \mathrm{s}^{2} \)
(3) \( -8 \mathrm{~m} / \mathrm{s}^{2} \)
(4) \( 4 \mathrm{~m} / \mathrm{s}^{2} \)
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