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Tell me? - Laws of motion - JEE Main-3

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 0.70ms^{-1} with respect to the man. The speed of the man with respect to the surface is :

  • Option 1)

    0.47ms^{-1}

  • Option 2)

    0.14ms^{-1}

  • Option 3)

    0.28ms^{-1}

  • Option 4)

    0.20ms^{-1}

 
Answers (2)
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Option 4

 

\Rightarrow 0=50v_{1}-20v_{2}

and also v_{1}+v_{2}=0.7

\Rightarrow v_{1}=0.2m/s


Option 1)

0.47ms^{-1}

Option 2)

0.14ms^{-1}

Option 3)

0.28ms^{-1}

Option 4)

0.20ms^{-1}

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