Sorry for maybe using wrong words, English is my first language but I can’t figure out how to word it correctly. Example: Hitting a metal mailbox with a metal bat while you’re in a moving vehicle. (Mailbox baseball is what google called it)
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energy has to go somewhere to decay, your hand is softer than the mailbox. energy will flow where it’s easiest.
When you have a hard object hitting another hard object the objects don’t absorb the blow well, so all the force goes into your hand and your hand absorbs the blow.