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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    A projectile is thrown with initial velocity \[{{\upsilon }_{0}}\] and angle \[{{30}^{o}}\] with the horizontal. If it remains in the air for \[1\text{ }s,\] what was its initial velocity?

    A)  \[19.6\text{ }m/s\]           

    B)  \[9.8\text{ }m/s\]

    C)  \[4.9\text{ }m/s\]            

    D)  \[1\text{ }m/s\]

    Correct Answer: B

    Solution :

    Time of flight \[T=\frac{2u\,\,\sin \theta }{g}\] Given, \[u={{v}_{0}},\,T=1s,\,\,\theta ={{30}^{o}},\,\,g=9.8m/{{s}^{2}}\] \[{{v}_{0}}=u=g=9.8m/s\]


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