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J & K CET Medical J & K - CET Medical Solved Paper-2006

  • question_answer
    A body of mass 2 kg is projected at 20 m/s at an angle \[60{}^\circ \] above the horizontal. Power due to the gravitational force at its highest point is :

    A)  200 W                                  

    B)  100\[\sqrt{3}\]W

    C)  50 W                                    

    D)  zero

    Correct Answer: A

    Solution :

                     Power (P) is given as \[P=F.v=Fv\cos \theta \] where F is force, v the velocity and\[\theta \]the angle between F and v. \[P=mgv\text{ }cos\theta \] Given, \[m=2\text{ }kg,\text{ }v=20\text{ }m/s,\text{ }\theta =60{}^\circ \] \[\therefore \]  \[P=2\times 20\times 10\times cos\text{ }60{}^\circ \] \[P=2\times 20\times 10\times 1\] \[\Rightarrow \]               \[P=200\text{ }W\]


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