Will a Bullet Shot Straight Up Fall Back to Its Starting Point?

[porkok]

If we shoot bullet to the air (90Degree) it will fall down to same spot or not ? (Without anther force)
Thanks

 

[NateTG]

Well, where are you shooting from?

I assume that the bullet is not going more than 6km/s?

 

[porkok]

From the ground (yes not over 6km/s). Could you give me answer and explanation ?
Thanks

 

[NateTG]

6km/s is Earth escape velocity. I think you'll find that the problem specifies that the bullet is being shot from the surface of the Earth.

If you shot the bullet straight up out of a moving car, would it come down and hit you? What if the car was turning? What if the someone stomped on the brakes?

 

[porkok]

Yes the bullet shot from the surface of the Earth and pistol is not moving. So it should fall down in the same spot ,right ?

 

[porkok]

We did not talk about another factor. (No other facetor in this situation)

 

[NateTG]

Is the Earth stationary?

 

[porkok]

earth is still moving around itself

 

[NateTG]

So, would the bullet move with the Earth after you shot it?

 

[HallsofIvy]

Yes. Conservation of momentum.

 

[porkok]

Could you explain about conservation of momentum ? Thanks

 

[NateTG]

Originally posted by HallsofIvy
Yes. Conservation of momentum.

Actually, since the Earth is spinning, the reference frame is accelerated, so the bullet would not be moving with the earth.