A rod of mass ′M′ is subjected to force ′t′ and ′2f′ at both the ends as shown in the figure. If young modulus of its material is ′y′ and its length is L find total elongation of rod.
A
fl2Ay
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B
flAy
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C
3fl2Ay
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D
4fl2Ay
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Solution
The correct option is C3fl2Ay To solve problem of these types we consider average force acting