11. Well, the ball would hit your hand and cause it to hit the rigid wall, bouncing off with more momentum since bounce. It would just hurt, alot.
12. The heavy truck has greater momentum, because it's mass is much greater. It will also need more stopping force.
13. If the skateboard's time was later, it would be harder to stop over a short distance in time.
14. Number 3 would go under the most momentum because of velocity change.
15. Greater impulse is required to slow down than to speed up.
16. Yes, and yes.
17. No, because mass can change when velocity doesn't.
18. It means that it neither loses or gains in quantity over a change.
19. When a bullet is fired equall forces push against both the bullet and the gun, so they cancel eachother out.
20. If there is no vector quantity, the bullet goes on forever, and therefor momentum cant be applied.
21. Elastic is where no energy is lost, and inelastic is the opposite.
22. If elastic, A stops moving and B goes at the same velocity as A was.
23. If inelastic, A is reduced to half speed and pushes along side B.
24. Because the collision is elastic, they both move at the same speed along side eachother diagonally.
25. It is the same.
