the moon example has me confused, you fire a bullet straight up even with out atmosphere it would…
Hoss Hoss
23

Firing a gun straight up with no atmosphere or anything else to interfere the bullet will be decelerated at a constant rate by gravity. When coming back down it will be accelerated at the same rate for the same distance so it’s velocity will be exactly equal to what it was when it left the barrel of the gun.

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