A particle executes $SHM$ of period $1.2\, sec$ and amplitude $8\, cm.$ Find the time it takes to travel $3\,cm$ from the positive extremity of its oscillation. ..... $\sec$
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$x=A \cos \omega t$
$\Rightarrow \quad 5 \mathrm{cm}=8 \cos \omega t$
$\Rightarrow \quad \omega t=0.9$
$\frac{2 \pi}{1.2} t=0.9$
$\Rightarrow \quad t=\frac{1.08}{2 \pi} \mathrm{s}=0.17 \mathrm{s}$
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