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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Motion Under Gravity

  • question_answer
    A man throws a ball vertically upward and it rises through 20 m and returns to his hands. What was the initial velocity \[(u)\] of the ball and for how much time \[(T)\] it remained in the air \[[g=10m/{{s}^{2}}]\]                                 [MP PET 2001]

    A)             u = 10 m/s, T = 2s    

    B)             u = 10 m/s, T = 4s

    C)             u = 20 m/s, T = 2s

    D)                      u = 20 m/s, T = 4s

    Correct Answer: D

    Solution :

                    \[u=\sqrt{2gh}=\sqrt{2\times 10\times 20}=20\ m/s\]             and \[T=\frac{2u}{g}=\frac{2\times 20}{10}=4\]sec         


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