Elevation And Depression
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A rocket launched vertically from \(A\) is observed from \(B\).
Soon after the launch when at position \(\mathrm{C}\) its angle of elevation is \(30^{\circ}\). After it climbs 5000 metres from this position to \(D\) its angle of elevation is \(65^{\circ}\)
i) Find \(\mathrm{BC}\) to the nearest metre.
ii) Find how far the observer is from the launching pad to the nearest metre.
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