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क्षैतिज से `15^@` कोण पर छोड़े गए प्रक्षेप्य की परास 1 किमी है । यदि इसे क्षैतिज से `45^@` कोण पर छोड़ा जाये तो परास क्या होगी ।

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`Rpropsin2theta,R_(15^(@))/R_(45^(@))=(sin^@30^@)/(sin90^@)=1/2,R_(45^(@))=2` किमी

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