A car is moving towards a building with speed 10 \( \mathrm{m} / \m...

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A car is moving towards a building with speed 10 \( \mathrm{m} / \mathrm{s} \). At any instant the angle of elevation of the building is \( 30^{\circ} \) after \( 5 \mathrm{sec} \). the angle of elevation of the building becomes \( 45^{\circ} \), then height of building is
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