A gun is fired parallel to the ground. At the same instant, a bullet of equal size and mass next to the

muzzle is released and drops to the ground. Which hits the ground first and why?

I think that the bullets will hit the ground at the same time because the bullet that is fired is shot at a faster speed and travels a longer distance, while the dropped bullet has a slower speed and travels less distance. The two factors cancel out?

1 answer

In the absence of other factors, both will hit the ground at the same time, because the force of gravity is all that's acting on them, making them fall at the same speed.

The horizontal speed of the bullet has no effect on the pull of gravity.

However, in real life, the aerodynamics of the fired bullet will probably keep it aloft a bit longer than the falling bullet.