Block is in equilibrium initially. Now we displaced the block by a distance \( 0.4 \mathrm{~m} \...

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Block is in equilibrium initially. Now we displaced the block by a distance \( 0.4 \mathrm{~m} \) downward and then
\( P \) release. Find time taken by the block to reach the natural length of the spring :-
W
(1) \( \frac{2 \pi}{3} \sqrt{\frac{2}{100}} \)
(2) \( 2 \pi \sqrt{\frac{2}{100}} \)
(3) \( \pi \sqrt{\frac{2}{100}} \)
(4) \( \frac{\pi}{3} \sqrt{\frac{2}{100}} \)
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