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Two rods AB and BC of equal cross-sectio...

Two rods AB and BC of equal cross-sectional area A and Young's constant `Y_1` and `Y_2` are joined and suspended from a fixed support A. A block of mass M is attached to the lowest point C. The density of the rods is negligibly small. Find displacement of the point C.

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The correct Answer is:
`(Mg)/A [l_1/y_1+l_2/y_2]`
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