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A telegraph post gets broken at a point ...

A telegraph post gets broken at a point against a storm and its top touches the ground at a distance 20 m from the base of the post making an angle `30^(@)` with the ground. What is the height of the post ?

A

`(40)/(sqrt3) m`

B

`20 sqrt3 m`

C

`40 sqrt3 m`

D

`30 m`

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