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JEE Main & Advanced Sample Paper JEE Main Sample Paper-42

  • question_answer
    Consider two observers moving with respect to each other at a speed v along a straight line. They observe a block of mass m moving a distance I on a rough surface. The following quantities will be same as observed by the two observers

    A)  kinetic energy of the block at time t

    B)  work done by friction

    C)  total work done on the block

    D)  acceleration of the block

    Correct Answer: D

    Solution :

    Since relative acceleration between the observers is zero, so acceleration of both the observers are same, as a result acceleration of block with respect to observers is same. Kinetic energy, work done by friction and total work done are depending on displacement and velocity of the blocks, which may be different' for both.


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