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NEET Sample Paper NEET Sample Test Paper-55

  • question_answer
    The masses of 10 kg and 20 kg respectively are connected by a massless spring as shown 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 backward direction. \[\therefore \] Net forward force on \[20\text{ }kg.\,mass=200-120\] \[=\,\,80\,N\] \[\therefore \,\,\,Acceleration=\,\,\frac{80}{20}=4\,m/se{{c}^{2}}\]


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