why can’t someone who is light in weight punch as hard as someone who is heavier?

Question

why can’t someone who is light in weight punch as hard as someone who is heavier?

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Answer 1

Basic physics – specifically Newton’s 2nd Law of Motion.

The force acting on an object (like a fist) is equal to mass times velocity. More mass, more force.

Same reason why the damage a vehicle accident causes varies depending on the size of the vehicles involved. Two cars at 30mph is generally survivable. A train hitting a car at 30mph… not so much.