Find maximum extension in spring : (Initially blocks are at rest an...

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Find maximum extension in spring :
(Initially blocks are at rest and spring is at natural
\( \mathrm{P} \) length)

W
(1) \( \frac{\mathrm{F}}{\mathrm{k}} \)
(2) \( \frac{\mathrm{F}}{2 \mathrm{k}} \)
(3) \( \frac{2 F}{k} \)
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