18. A 0.56 kg fireworks ball is fired from a 15 kg cannon at 650 m/s to a target. What is the recoil speed of the cannon? 19. A 12 kg weight lifter's ball is thrown at 2.5 m/s to a persen sitting on a resting 18.3 kg raft. If the raft and the person continue moving together, after the person catches the ball, what will be their velocity? (It will be a negative answer.) ) _ BEFORE AFTER 20. What is the velocity of 3m/s -2m/s 2_m/s -3m/s the cart, at right, not yet i s [ i -+ - - labeled if both carts have = m identical size and mass? m 21. What is the impulse applied to a 6.5 kg cart that changes from 1.28 m/s to 3.33 m/s in 5.0 seconds. 22. A 30 kg child sits in n shopping cart at rest while facing a second shopping cart with a 30 kg child inside. If the two children push off from each other, and the carts move perfectly straight, away from each other, how will their momentums compare to each other? (same) (opposite and equal) (opposite and different) (completely different) (doubled) 23. What impulse must be applied to a 874 kg car to cause the velocity to change by 12.8 m/s