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Q.

Why isn't the man attempting to pull himself up by yanking on his hair successful?

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a

The exerted force is small.

b

Newton's law of inertia is not applicable to living beings.

c

The frictional force in play while gripping is small.

d

The force applied is internal to the system.

answer is C.

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Detailed Solution

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By applying an internal force, momentum of the system will not change. Hence, Due to the force applied is internal to the system. Man won't be successful to pull himself by tugging on his hair

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