A particle moves according to the equation \( \mathrm{x}=\mathrm{a}...

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A particle moves according to the equation \( \mathrm{x}=\mathrm{a} \cos \pi \mathrm{t} \). The distance covered by it in \( 2.5 \mathrm{~s} \) is
(A) \( 3 a \)
(B) \( 5 \mathrm{a} \)
(C) \( 2 \mathrm{a} \)
(D) \( 9 \mathrm{a} \).
\( \mathrm{P} \)
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