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A block of mass \( 200 \mathrm{~g} \) executing SHM under the influence of a spring of spring constant \( k=90 \mathrm{~N} \mathrm{~m}^{-1} \)
\( \mathrm{P} \) and a damping constant \( b=40 \mathrm{~g} \mathrm{~s}^{-1} \). The time

W elapsed for its amplitude to drop to half of its initial value is \( ( \) Given, \( \ln (1 / 2)=-0.693) \)
(a) \( 7 \mathrm{~s} \)
(b) \( 9 \mathrm{~s} \)
(c) \( 4 \mathrm{~s} \)
(d) \( 11 \mathrm{~s} \)
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