In free space, far away from any influential gravity, if I were to shoot a
gun (bullet starts at 1000 ft/sec., or hit a golf ball with my driver, or
even throw a baseball (you can plug in the arbitrary numbers for the initial
acceleration), how far will these aforementioned objects travel? Will their
speed EVER change? I know that this is probably a sophomoric question for
most of you, but please indulge me. Thank you.

Cordially,
west