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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    The kinetic energy of a projectile at the highest point is half of its initial kinetic energy. The angle of projection is

    A)  \[30{}^\circ \]                                  

    B)  \[45{}^\circ \]

    C)  \[60{}^\circ \]                                  

    D)  None of these

    Correct Answer: B

    Solution :

                    \[{{K}_{4}}=K{{\cos }^{2}}\theta =\frac{K}{2}\] \[\cos \theta =\frac{1}{\sqrt{2}}\] \[\cos \theta =\cos 45{}^\circ \Rightarrow \theta =45{}^\circ \]


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