What will be the speed of the bullet ?

Question

When a gun is fired vertically up into the sky the speed of the bullet will be retarded due to gravity and finally reach zero .Then it will start comming down and increase speed due to gravity.Will it attain the same speed as it shot up?

Answer 1

If we ignore air resistance, yes. Conservation of energy says that the bullet would have the same amount of kinetic energy as it originally had, when it has the same amount of gravitational potential energy as it also originally had (i.e., when it is at the same height from which it was shot). That means it would have the same speed. It would then go even a little faster still, right before it hits the ground, because this occurs at a slightly lower height than from which it was shot.

If we do not ignore air resistance, then no. Air resistance is a type of friction, which does work against the bullet along its entire path length, meaning it would have less kinetic energy when it landed than when it was shot, and thus less speed. Specifically, the bullet will probably end up falling from high enough that it will reach its constant terminal velocity, which would be less than the muzzle velocity.

Answer 2

Considering no friction (air resistance), the bullet must leave the gun at the same velocity it will hit the ground with. As it moves upwards, it will be pulled down by gravity and the velocity will slow until v=0. As it moves downwards gravity will then accelerate it. Gravity will accelerate it exactly the amount it left the gun at. This also assumes the gun is on the ground at zero height. If not, technically the bullet will hit the ground at a higher speed than it left the gun at.

Answer 3

It depends on the force the bullet was fired at.

If the bullet goes high enough, then it will reach terminal velocity on the way down. This will stop the bullet form reaching the same speed as it was shot up.

If the force is such that the bullet can't reach terminal velocity, then it will reach the same speed that it was fired at (ignoring air resistance).

Answer 4

That depends upon the bullet. Some British revolvers fired heavy bullets at 550 ft/sec, while a .220 Swift fires a bullet at 4110 ft/sec. Both bullets would achieve the same velocity when they fell due to the constant acceleration of gravity.

Answer 5

I artwork with this on a daily foundation. the speed of the bullet, even tho its interior the chamber remains that comparable using fact the Jet. whilst the jet fires the bullet the bullet then travels a similar speed using fact the jet + the cost of the bullet.

Answer 6

in the normal conditions no, but theorically , under idol conditions yes, its conservation of energy law, the potintial energy completly turns to kinatic, and when it reaches zero velocity, ignoring air resistance all the kinatik energy turns to potintial again, and then the bullet comes down due to the gravity, and it attains full speed, and its about 366 m/s for a normal gun(hand gun).

sorry for the spelling mistakes, i suck in typing :(

Answer 7

Yes it will, If there is no energy loss. When the bullet reaches altitude of the gun it will have the same speed. Energies must be equal at the same altitude from the earth, and since there is no mass loss of the bullet, it must have the same speed, Ek=mv^2.

Answer 8

Yes, but only in absense of air. In the air, the bullet will not reach the same speed due to aerodynamic drag.

Answer 9

When the bullet is fired the energy expended is Kinetic. when the bullet reaches zenith, all the kinetic energy it took to get the bullet to its altitude is now stored in the bullet as Potential energy. When the bullet falls back to earth the potential energy becomes kinetic energy. Therefore Kinetic energy = Potential Energy.

Answer 10

if u apply the eqns of motion, the speed at which bullet returns is equal to initial speed.
but practically due to retardation of air, it does not happen