1. The problem statement, all variables and given/known data At the instant a horizontally held rifle is fired over a level range, a bullet held at the side of the rifle is released and drops to the ground. Which bullet, the one fired downrange or the one dropped from rest, strikes the ground first? 2. Relevant equations None 3. The attempt at a solution My answer: The one dropped from rest strikes the ground first. If we're ignoring air drag, then the bullet will keep moving - at a constant velocity (forever); the bullet that is dropped will accelerate toward the ground, acting under the influence of gravity; thus the dropped bullet will hit the ground first. This answer, obviously, is wrong. Right answer: both bullets fall the same vertical distance with the same acceleration g due to gravity and therefore strike the ground at the same time. But I don't understand why this is the case, even after reading that. Can someone help me out?