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The cable of a uniformly loaded suspensi...

The cable of a uniformly loaded suspension bridge hangs in the form of a parabola . The roadway which is horizontal and `100` m long is supported by vertical wires attached to the cable, the longest wire being `30` m and the shortest being `6`m. Find the length of a supporting wire attached to the roadway`18` m from the middle.

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The correct Answer is:
`9.11`m(approx).
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