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Let an object be placed at some height h...

Let an object be placed at some height h cm and let P and Q two points of observation which are at a distance 10 cm a part on a line inclined at angle 15° to the horizontal. If the angles of elevation of the object from P and Q are `30^@ and 60^@` respectively then find h.

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The correct Answer is:
`5 sqrt(2) = AB = h`.
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