# Bullet in the air

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

Homework Helper
Well, where are you shooting from?

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

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

Homework Helper
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?

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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 ?

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

Homework Helper
Is the Earth stationary?

earth is still moving around itself

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

Homework Helper
Yes. Conservation of momentum.

Could you explain about conservation of momentum ? Thanks