the following question is confusing me: An ax is swung against a tree with a blow of 4000N. The force that acts on the axe during this event is: a) less then 4000N  b)4000N C) greater then 4000N d) 0 I know the answer is b) 4000N. But why is the foce not 8000N? Is the tree not supposed to exert an equal but opposite force on the axe?

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Relativistic Energy and Momentum

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