Physics
A spring is an example of which of these

Newton's 3rd law
Hooke's law
Newton's 1st law
Conservation of mass law

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It is smaller than the earth
It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth

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