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Which object hits the ground first, a bullet fired horizontally or a bullet dropped from the same height?

Question #42123. Asked by Hamlet..

Hijakr
Answer has 1 vote
Hijakr
21 year member
14 replies

Answer has 1 vote.
They will both hit the ground at the same time as they both start with 0 vertical velocity and are acted upon by the same gravitational force.

This however is in a vacuum and I'm not sure about the wind-resistance of bullets, but I'd say the difference would be negligible.

Dec 08 2003, 9:26 PM
gmackematix
Answer has 0 votes
gmackematix
21 year member
3194 replies

Answer has 0 votes.
The dropped bullet will probably hit the ground first but I'm not entirely sure. Under gravity in a vacuum they would hit the ground at the same time as Hijakr (and Galileo before him) points out, but in air the long trajectory will cause it to spin through more air at a continuously changng angle. I say I'm not sure because air is a fluid and the fluid dynamics of the air around a bullet is quite complex.

Dec 08 2003, 9:50 PM
RickF
Answer has 17 votes
Currently Best Answer
RickF
21 year member
227 replies

Answer has 17 votes.

Currently voted the best answer.
According to this site, they will hit the ground at the same time

link http://hyperphysics.phy-astr.gsu.edu/hbase/grav.html

Dec 09 2003, 4:40 AM
sequoianoir
Answer has 0 votes
sequoianoir
21 year member
2091 replies

Answer has 0 votes.
If the gun fired ultra high velocity rounds then the one that is fired potentially has "further to fall" due to the curvature of the Earth.

Secondly, what you have in your hand (before being fired - ie a "round") is vastly different to the chunk of metal that leaves the barrel at many MPH.
A dropped "bullet" has a case that contains the explosive. When fired this is left behind in the gun and is not part of the projectile !

Dec 17 2003, 3:04 PM
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