JEE Main & Advanced Sample Paper JEE Main Sample Paper-15

  • question_answer
    A mass at rest explodes into 4 identical particles which fly in different directions in same plane with equal speeds. Which of the following combination of angles may be the right set showing the possible direction?

    A)  \[0{}^\circ ,\,\,60{}^\circ ,\,\,120{}^\circ ,\,\,240{}^\circ \]           

    B)  \[0{}^\circ ,\,\,75{}^\circ ,\,\,150{}^\circ ,\,\,225{}^\circ \]

    C)  \[0{}^\circ ,\,\,90{}^\circ ,\,\,180{}^\circ ,\,\,270{}^\circ \]           

    D)  \[0{}^\circ ,\,\,30{}^\circ ,\,\,180{}^\circ ,\,\,270{}^\circ \]

    Correct Answer: C

    Solution :

    As\[{{\overrightarrow{F}}_{ext}}=0,\overrightarrow{P}=\]constant\[{{\overrightarrow{P}}_{i}}=0\] suitable options can be checked. The vector sum of final momentum should be 0

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