JEE Main & Advanced Physics NLM, Friction, Circular Motion JEE PYQ - NLM Friction Circular Motion

  • question_answer
    A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of \[0.70\,m{{s}^{-1}}\] with respect to the man. The speed of the man with respect to the surface is : [JEE Main Held on 12-4-2019 Morning]

    A) \[0.20\,m{{s}^{-1}}\]

    B) \[0.14\,m{{s}^{-1}}\]

    C) \[0.47\,m{{s}^{-1}}\]

    D) \[0.28\,m{{s}^{-1}}\]

    Correct Answer: A

    Solution :

    \[\Rightarrow 0=50{{V}_{1}}-20{{V}_{2}}\]and\[{{V}_{1}}+{{V}_{2}}=0.7\]\[\Rightarrow {{V}_{1}}=0.2\]

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