NEET Sample Paper NEET Sample Test Paper-17

  • question_answer Three blocks of masses\[{{m}_{1}},{{m}_{2}}\]and\[{{m}_{3}}\]are connected by massless string as shown in the figure on a friction- less table. They are pulled with a force\[{{T}_{3}}=40\,N.\]If \[{{m}_{1}}=10\,kg,\,{{m}_{2}}=6kg\]and \[{{m}_{3}}=4\,kg,\]tension \[{{T}_{2}}=\]will be

    A)  20 N              

    B)  40 N              

    C)  10 N              

    D)  32 N

    Correct Answer: D

    Solution :

    Common acceleration, \[a=\frac{F}{{{m}_{1}}+{{m}_{2}}+{{m}_{3}}}=\frac{40}{10+6+4}=2\,m/{{s}^{2}}\] Equation of motion of \[{{m}_{3}}\]is \[{{T}_{3}}-{{T}_{2}}={{m}_{3}}a\] \[40-{{T}_{2}}=4\times 2,{{T}_{2}}=32\,N\] Hence, the correction option is [d].

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