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  3. 8th Class
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  5. Force and Pressure

8th Class Science Force and Pressure Question Bank Force and Pressure Formative Objective Problems

  • question_answer
    A body is thrown up with a velocity of 20 m/s. The maximum height attained by it is approximately

    A)  80 m                                    

    B)  60 m

    C)  40 m                                    

    D)  20 m

    Correct Answer: D

    Solution :

      \[u=20\text{ }m/s\] \[v=0\] \[h=?\] \[\text{g}=10\text{ }m/{{s}^{2}}\] We know \[{{v}^{2}}{{u}^{2}}=2gh\] \[{{0}^{2}}={{20}^{2}}=2(9.8)h\] \[h=\frac{20\times 20}{2\times 10}=20\,m\]


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