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According to Newton's Law, every
force has an equal and opposite force. When an automobile crashes into
a wall with the force of 2,000 pounds, the wall will return a force of
2,000 pounds; or forcing the end of a seesaw down with a ton of weight
will provide an upward force of the same weight; if your opponent is
rushing towards you at a high speed, by the slightest blow at his head,
the force with which you strike his head would be that of his own
onslaught plus that of your blow.
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The two forces combined: his, which is large, and yours, which are small, are quite impressive. This then is the reaction force from the opponent. Another reaction force is your own. A punch with the right fist is added by pulling back the left fist to the hip.
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