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Added mass would be an advantage and yes, there is weight classes.

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Weight and mass affects boxing because you have to have enough punching power to over come gravity and air resistance

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Gravity and air resistance are some of the forces acting with a punch

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The boxer will remain at rest until the bell rings or until the opponent throws a punch.

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Newtons laws apply to boxing from the acceleration of the punch to a person hitting the ring

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The action is you hitting someone and the possible reaction is them falling down, stumbling, or hitting you back.

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Acceleration of a punch can increase the amount of damage being done in a punch.

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Boxing relates to inertia because two people are constantly moving around a ring.