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A vertical post 15 ft high is broken at ...

A vertical post 15 ft high is broken at certain height and its upper part, not completely separated, meets the ground at an angle of 30°. Find the height at which the post is broken.

A

(a)`10` ft

B

(b)`5` ft

C

(c)`15sqrt(5(2-sqrt3)` ) ft

D

(d)`5sqrt3 ft`

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