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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    Two blocks of masses 5kg and 2kg are connected by a massles a string as shown in the figure. A verticle force F is applied on the 5kg block. Find tghe value of F, its tension in the string is \[40N\] \[(g=10m/{{s}^{2}})\].

    A)  \[140\,N\]            

    B)  \[70\,N\]

    C)  \[40\,N\]                     

    D)  \[100\,N\]

    Correct Answer: A

    Solution :

    Free body diagram, For body of mass 5kg             \[F-5g-T=5a\]                 \[F=5a+5g+T\]                 \[=5a+50+40=5a+90\]                 \[F=5a+90\]                                        ?(i) Now for body of mass 2kg             \[T-2g=2a\]                 \[\frac{40-20}{a}=a\]                 \[a=10m/{{s}^{2}}\]                        ?..(ii) From equations (i) and (ii), we get             \[F=140\,m\]            


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