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NEET Sample Paper NEET Sample Test Paper-67

  • question_answer
    The masses of 10 kg and 20 kg respectively are connected by a massless spring as shown 3 in figure. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has acceleration\[12\text{ }m/se{{c}^{2}}\]. What is the acceleration of 20 kg mass?  

    A) \[12\text{ }m/se{{c}^{2}}\]                 

    B) \[4\text{ }m/se{{c}^{2}}\]

    C) \[10\text{ }m/se{{c}^{2}}\]                 

    D) Zero

    Correct Answer: B

    Solution :

    As the mass of 10 kg has acceleration \[12\text{ }m/se{{c}^{2}}\] therefore it apply 120 N force on mass 20 kg in a backward direction. \[\therefore \] Net forward force on 20 kg mass \[= 200 - 120\]    \[=\,\,80\,N\] \[\therefore \,\,Acceleration\,\,=\,\,\frac{80}{20}\,\,=\,4\,m/{{\sec }^{2}}\]


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