NEET Sample Paper NEET Sample Test Paper-34

  • question_answer Two smooth objects with a coefficient of restitution e, collides directly and bounce as shown :- just before impact just after impact   Newton's law of restitution gives:-

    A)  \[{{v}_{1}}=3\,eu\]

    B)  \[u=3\,e{{v}_{1}}\]

    C)  \[{{v}_{1}}=2\,eu\]                                         

    D)  It cannot be applied as the masses are not known   

    Correct Answer: B

    Solution :

    \[e=\frac{velocity\,\,of\,\,separation}{velocity\,\,of\,approach}\] \[\Rightarrow \]  \[e=\frac{{{v}_{1}}-2{{v}_{1}}}{3u-6u}=\frac{{{v}_{1}}}{3u}\] \[\Rightarrow \]\[{{v}_{1}}=3eu\]

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