A student 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

1) as the force exerted is small

2) the frictional force while gripping, is small

3) Newton’s law of inertia is not applicable to living beings

4) as the internal force applied is to the system

Answer: 4) as the internal force applied is to the system

Solution:

By applying an internal force momentum of the system will not change. So he will not succeed. 

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