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KVPY Sample Paper KVPY Stream-SX Model Paper-28

  • question_answer
    A particle which is experiencing a force, given by \[\overrightarrow{F}=3\hat{i}-12\hat{j},\]undergoes a displacement of \[\overrightarrow{d}=4\hat{i}.\] If the particle had a kinetic energy of \[3j\]at the beginning of the displacement, what is its kinetic energy at the end of the displacement?

    A) \[9j\]

    B) \[12j\]

    C) \[10j\]

    D) \[15j\]

    Correct Answer: D

    Solution :

    \[K.E.-3=\overrightarrow{F}.\overrightarrow{d}\]
    \[K.E.=3+(3\hat{i}-12\hat{j})\times (4\hat{i})\]
    \[K.E.=3+12=15J.\]


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