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9th Class Science Gravitation and Floatation Question Bank Gravitation and Pressure

  • question_answer
    Two stones are thrown from the top of a building with the same speed\[u\], one in the upward direction and the other in the downward direction. When they reach the ground/they acquire certain velocities \[{{v}_{1}}\] and \[{{v}_{2}}\] respectively. What is the ratio of \[{{v}_{1}}\] and\[{{v}_{2}}\]?

    A) \[1:1\]                 

    B)        \[1:2\]

    C) \[2:1\]               

    D)        \[2:3\]

    Correct Answer: A

    Solution :

     The first stone and the second stone possess the same velocity \['u'\] during their downward journey at the roof of the building. They are acted on by the same acceleration. Therefore, they will strike the ground with the same velocity.


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