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9th Class Science Time and Motion Question Bank Motion IIT JEE Objective Problems

  • question_answer
    A particle starts moving from rest under uniform acceleration. It travels a distance x in the first two seconds and a distance y in the next two seconds. If y = nx, then n=..........

    A)  1                                            

    B)  2   

    C)  3                            

    D)  4

    Correct Answer: C

    Solution :

    \[X=\frac{1}{2}a{{(2)}^{2}}\Rightarrow X=2a\] \[X+Y=\frac{1}{2}a{{(4)}^{2}}=\frac{1}{2}a(16)\] \[X+Y=8a\] \[Y=8a-X\Rightarrow \,=8a-2a=6a\] \[\frac{Y}{x}=\frac{6a}{2a}\Rightarrow Y=3x\,\,(or)\,\,n=3\]


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