9mm ammunition from handguns can travel 2500 meters. At that distance the bullet will not have much energy left. Fatal hits at distances over 100 meters are uncommon (mostly due to difficulty in hitting anything at that distance).
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It is 7 mm - 2 mm = 5 mm.
9 mm * 9 mm = 81 mm2 = 0.81 cm2
1 mm is the thickness of a dime. 1cm is 10 mm
1 cm = 10 mm 2 cm = 20 mm 3 cm = 30 mm . . 9 cm = 90 mm That's more than 77 mm.
It is a length of 45 mm.