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A student unable to answer a question on Newton’s law of motion attempts to pull himself up by tugging on his hair. He will not succeed ___________

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A student unable to answer a question on Newton’s law of motion attempts to pull himself up by tugging on his hair. He will not succeed ___________

(a) As the force exerted is small

(b) The frictional force while gripping is small

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

(d) As the force applied is internal to the system

The question was asked in unit test.

The question is from Laws of Nature topic in section Laws of Motion of Engineering Physics I

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The correct choice is (d) As the force applied is internal to the system

For explanation: The force applied by the student into himself is an internal force. According to Newton’s law, only an external force can change the state of motion of an object.

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