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WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    An athlete throws a discus from rest to a final angular velocity of 15 rad/s in 0.270 s before releasing it. During acceleration, discus moves a circular arc of radius 0.810 m. Acceleration of discus before it is released is..... . \[m{{s}^{-2}}.\]

    A)  45                                         

    B)  182

    C)  187                                       

    D)  192

    Correct Answer: A

    Solution :

                     \[\omega ={{\omega }_{0}}+\alpha \,t\] \[\Rightarrow \]               \[\omega =0+\alpha \,t\] \[\Rightarrow \]               \[\alpha =\frac{15}{0.270}\,rad/{{s}^{2}}\] Now,     \[a=r,\,\alpha =0.81\times \frac{15}{0.270}=45\,m{{s}^{-2}}\]


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