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9th Class Science Gravitation and Floatation Question Bank Gravitation IIT JEE Objective Problems

  • question_answer
    A body sliding on a smooth inclined plane requires 4s to reach the bottom starting from rest at the top. Time taken by it to cover one fourth of the distance starting from rest at the top is

    A)  1 s                         

    B)  2 s   

    C)  4 s                         

    D)  16 s

    Correct Answer: B

    Solution :

      \[t=\sqrt{\frac{2h}{g}}\] \[\frac{{{t}_{1}}}{{{t}_{2}}}=\sqrt{\frac{{{h}_{1}}}{{{h}_{2}}}}\] \[\frac{4}{x}=\sqrt{h/h/4}\] \[\frac{4}{x}=2\] \[x=\frac{4}{2}=2\sec \]


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