Displacement of a particle in periodic motion is expressed as \( x(t)=20 \cos \omega t \). If th...

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Displacement of a particle in periodic motion is expressed as \( x(t)=20 \cos \omega t \). If the time period of particle motion is \( 4 \mathrm{~s} \), then displacement of the particle in \( 1 \mathrm{~s} \) will be
(a) \( 10 \mathrm{~m} \)
(b) \( 15 \mathrm{~m} \)
(c) 0
(d) \( 20 \mathrm{~m} \)
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