if we fire a bullet perpendicularly upwards then when it comes down .....will it have the same velocity at the same point when it was fired ??
Please explain why(if so)!!!
2006-06-16 00:32:41 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Friction aside, think of it like this:
when the bullet is fired it has a certain amount of speed. every second that speed is being reduced by gravity by 9.8 m/s. So when it reaches as far up as it will go it stops because gravity has subtracted 9.8 from from the original speed every second until the speed is 0. Like taking out money from an account. So now you can spend all the money you have-it's got potential. Then it starts moving toward earth. gravity is still working at the same rate. so it picks up speed at the same rate that it lost it last time. And it's the same distance, so it'll take the same amount of time. So now you're depositing the money into a different account. You only have the money you took out of the first account, so that's how much the second account will have.
I hope that explains it for you.
2006-06-16 01:53:50 · answer #1 · answered by TheHza 4 · 2⤊ 2⤋
1. If you would conduct this experiment in the vacuum then the bullet would have the same velocity at the point it was fired when the bullet will return to it.
Kinetic energy=potential energy=kinetic energy
2. If fire the gun the environment that has an atmosphere then you have to consider the resistance of air would have on the bullet. The bullet’s energy would be dissipated as it goes up as well as it comes back down.
Kinetic energy - work done against the air (upward) = potential energy - work done against the air (downward) = kinetic energy
2006-06-16 07:46:01 · answer #2 · answered by Edward 7 · 0⤊ 0⤋
No.
It will have its terminal velocity when it comes back down, which will be much lower.
Terminal velocity is the velocity when the resistance due to the air (which depends on velocity) equals the force of gravity.
2006-06-16 07:36:36 · answer #3 · answered by Epidavros 4 · 0⤊ 0⤋
nope see since the earth rotates it will not come down at the same exact point and the friction will cause it to slow yep does this have anything to do with taking over the world ? hmmmm BAd BOy BABy
2006-06-16 08:39:29 · answer #4 · answered by ♥ The One You Love To Hate♥ 7 · 0⤊ 0⤋
no it will only fall at the terminal velocity of the earths gravitational pull.
2006-06-16 07:36:16 · answer #5 · answered by ? 6 · 0⤊ 0⤋
depends on the gun and the round
2006-06-16 07:36:11 · answer #6 · answered by ? 2 · 0⤊ 0⤋
no
2006-06-16 08:15:55 · answer #7 · answered by farzad g 2 · 0⤊ 0⤋