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A block of mass \( 10 \mathrm{~kg} \) connected to another hollow block of same size and negligible mass,
\( \mathrm{P} \) by a spring of spring constant \( 500 \mathrm{~N} / \mathrm{m} \), floats

W in water as shown in the figure. The compression in the spring is
\[
\left(\rho_{\text {water }}=1 \times 10^{3} \mathrm{~kg} / \mathrm{m}^{3}, \mathrm{~g}=10 \mathrm{~m} / \mathrm{s}^{2}\right)
\]
(1) \( 10 \mathrm{~cm} \)
(2) \( 20 \mathrm{~cm} \)
(3) \( 50 \mathrm{~cm} \)
(4) \( 100 \mathrm{~cm} \)
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