Nothing, it's just momentum (or newton's first law of motion, https://en.wikipedia.org/wiki/Newton's_laws_of_motion https://en.wikipedia.org/wiki/Newton's_laws_

Nothing, it's just momentum (or newton's first law of motion, https://en.wikipedia.org/wiki/Newton's_laws_of_motion https://en.wikipedia.org/wiki/Newton's_laws_of_motion)