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  4. A Student is unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on his hair. He will not succeed :

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Q. A Student is unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on his hair. He will not succeed :

NTA AbhyasNTA Abhyas 2022

Solution:

In this case internal force is applied on the system, so he will not succeed. According to Newton's law the state of a body can only be changed if some external force is applied on it.