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9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A body is thrown vertically upwards and rises to a height of 10 m. The velocity with which the body was thrown upwards is \[\left( \text{g }=\text{ 9}.\text{8 m}/{{\text{s}}^{\text{2}}} \right)\]

    A)  16 m/s                

    B)         15 m/s

    C)  14 m/s                  

    D)         12m/s

    Correct Answer: C

    Solution :

     From \[{{v}^{2}}={{u}^{2}}-2gh\]            \[0={{u}^{2}}-2\times 9.8\times 10\] \[\Rightarrow \]    \[{{u}^{2}}=196\] \[\Rightarrow \]     \[u=14\,\,m/s\]


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