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NEET Sample Paper NEET Sample Test Paper-7

  • question_answer
    A block Q of mass m is placed on a horizontal frictionless surface AB and a body P of mass m is released on its frictionless slope. As P slides by 9 length L on this slope of inclination \[\theta \], the block Q would slide by distance                        

    A)              \[\frac{m}{M}L\,\cos \theta \]           

    B)  \[\frac{m}{M+m}L\]

    C)              \[\frac{M+m}{mL\,\cos \theta }\]                 

    D)  \[\frac{mL\,\cos \theta }{m+M}\]

    Correct Answer: D

    Solution :

    Here, the x-coordinate of centre of mass of the system remains unchanged when the mass m moved a distance \[L\,\cos \theta ,\] Let the mass \[(m+M)\]moves a distance X in the backward direction. \[\therefore \] \[(m+m)x-m\,L\,\cos \theta =0\]                 \[X-\frac{mL\cos \theta }{m+M}\] Here, note that the Y-coordinate of the centre of mass would be change.


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