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A boy standing at a point O finds his kite flying at a point P with distance . It is at a height . It is at a height from the ground. When thread is extended by from the ground. When thread is extended by from P it reaches the point Q. What will be the height of QN of the kite from the ground?

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answer is B.

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Detailed Solution

From the given figure we have,

Δ OPM

and

Δ OQN

are similar triangles .And we know that in similar triangles the sides are in the same proportional.

\frac{QN}{PM}

\frac{QN}{PM}

\Rightarrow \frac{h}{5}

\frac{35}{25}

\Rightarrow h

\frac{5 \times 35}{25}

\Rightarrow h

7 cm

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