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A student unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on her 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 internal force applied is to the system

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The correct Answer is:
D
In this case the internal forceis 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.
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