कोई लड़ाकू जहाज \( 1.5 \mathrm{~km} \) की ऊंचाई पर \( 720 \mathrm{~km} / \mathrm{h} \) की चाल से...

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कोई लड़ाकू जहाज \( 1.5 \mathrm{~km} \) की ऊंचाई पर \( 720 \mathrm{~km} / \mathrm{h} \) की चाल से क्षैतिज दिशा में उड़ रहा है और किसी वायुयान भेदी तोप के ठीक ऊपर से गुजरता है । ऊर्ध्वाधर से तोप की नाल का क्या कोण हो जिससे \( 600 \mathrm{~m} \mathrm{~s}^{-1} \) की चाल से दागा गया गोला वायुमान पर वार कर सके । वायुयान के चालक को किस न्यूनतम ऊंचाई पर जहाज को उड़ाना चाहिए जिससे गोला लगने से बच सके। \( \left(g=10 \mathrm{~m} \mathrm{~s}^{-2}\right) \)
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