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JEE Mains · Physics · STD 11 - 3.2 motion in plane

किसी प्रक्षेप्य के प्रक्षेप-पथ को, भू पृष्ठ पर \(y =2 x -9 x ^{2}\) से निरूपित किया जाता है। यदि, इसे \(v_{0}\) चाल द्वारा \(\theta_{0}\) कोण पर प्रमोचित किया गया होता तो? \(\left( g =10 ms ^{-2}\right) \text { : }\)

  1. A \({\theta _0} = {\cos ^{ - 1}}\,\left( {\frac{1}{{\sqrt 5 }}} \right)\) तथा \({v_0} = \frac{5}{3}\,m{s^{ - 1}}\)
  2. B \({\theta _0} = {\cos ^{ - 1}}\,\left( {\frac{2}{{\sqrt 5 }}} \right)\) तथा \({v_0} = \frac{3}{5}\,m{s^{ - 1}}\)
  3. C \({\theta _0} = {\sin ^{ - 1}}\,\left( {\frac{2}{{\sqrt 5 }}} \right)\) तथा \({v_0} = \frac{3}{5}\,m{s^{ - 1}}\)
  4. D \({\theta _0} = {\sin ^{ - 1}}\,\left( {\frac{1}{{\sqrt 5 }}} \right)\) तथा \({v_0} = \frac{5}{3}\,m{s^{ - 1}}\)
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Correct Answer

(A) \({\theta _0} = {\cos ^{ - 1}}\,\left( {\frac{1}{{\sqrt 5 }}} \right)\) तथा \({v_0} = \frac{5}{3}\,m{s^{ - 1}}\)

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\begin{array}{l} Equation\,of\,trajectory\,is\,given\,as\\ \,\,\,\,\,\,\,\,\,\,y = 2x - 9{x^2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,...\left( A \right)\\ \,\,\,Comparing\,with\,equation\,\,\,\,\,\,\,\,\,\,\,\,\\ \,\,\,\,\,\,\,\,\,y = \,X\,\tan \,\theta -…

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