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NTSE Sample Paper NTSE SAT Practice Test-16

  • question_answer
    Tripling the speed of a motor car multiplies the distance needed for stopping it by

    A) 3

    B) 6

    C) 9

    D) Nothing can be decided

    Correct Answer: C

    Solution :

    [c] \[F\times S=\frac{1}{2}\text{ }m{{v}^{2}}~\] or         \[S\propto \,{{v}^{2}}\] When v is tripled, S becomes 9 times.


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