NEET Sample Paper NEET Sample Test Paper-39

  • question_answer A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of

    A)  \[\sqrt{2}:1\]

    B)  2 : 1

    C)  1 : 2

    D) \[1:\sqrt{2}\]

    Correct Answer: C

    Solution :

     Kinetic energy \[=\frac{1}{2}m{{v}^{2}}\] As both balls are falling through the same height, therefore they possess same velocity. but \[KE\propto m\] (If\[v=\]constant) \[\therefore \] \[\frac{{{(KE)}_{1}}}{{{(KE)}_{2}}}=\frac{{{m}_{1}}}{{{m}_{2}}}=\frac{2}{4}=\frac{1}{2}\]

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