Doubts on SHM

asas asasas

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Guys any suggestions on how to proceed? The first one specially .

or Liquid at y=0 density is d, but of object is 4d, as the object sinks density of liquid increase by which it again comes up…
Write Force equation, whatever the coefficient of x is the k


then Time period wala formula,

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for the second one i have a very complication solution…
i have taken Acm, then separated the two springs (spring constant inverse prop of length) uske bad F=kx,anyone has better solution?

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Thankss solved the second one but still cant get the first one please post the solution .

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in which part do you have problem in?