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एक प्रक्षेप्य का प्रारम्भिक वेग `(30 hati + 40hatj)` मीटर/सेकण्ड है | इसका प्रक्षेपण कोण, उड्डयन कल, महत्तम ऊँचाई तथा क्षैतिज प्रेस ज्ञात कीजिए | ( g= 10 मीटर/सेकण्ड`""^(2)`)

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प्रक्षेप्य का वेग `u = 30 hati + 40 hatj = u_(x) hati + u_(y) hatj`
अतः प्रारम्भिक वेग u का क्षैतिज घटक `u_(x) = u cos theta_(0) = 30`, ऊर्ध्वाधर घटक `u(y) = u sin theta_(0) = 40`
जहाँ `theta_(0)` प्रक्षेपण कोण है| अतः
`tan theta_(0) = (40)/(30) " " therefore " "theta_(0) = tan^(-1) ((4)/(3))`.
उड्डयन कल `T = (2 u sin^(2) theta_(0))/(g) = (2xx 40)/(10) =8` सेकण्ड |
महत्तम ऊँचाई `h = (u^(2) sin^(2) theta_(0))/(2g) = ((40)^(2))/( 2xx 10) = 80` मीटर |
क्षैतिज परास R = क्षैतिज वेग `xx` उड्डयन कल ` = 30 xx 8 = 240` मीटर |

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