(A) A bat exerts an average force of 259 lb on a 0.6 lb ball for 0.01 s. The incoming velocity of the ball was 44 ft/s. If it leaves in the opposite direction, what is its velocity? ft/s
(B) A cue stick strikes a pool ball with an average force of 80 N over a time of 12 ms. If the mass of the ball is 200 g, what will be its velocity? m/s
(C) A 22 kg girl and a boy on roller skates stand at rest facing each other. They push each other as hard as they can, and the boy moves to the left with a velocity of 2 m/s, while the girl moves to the right with a velocity of 4 m/s. What is the mass of the boy? kg
(D) A 25 kg child is at rest in a wagon. The child jumps forward at 6 m/s, sending the wagon backward at 13 m/s. What is the mass of the wagon? kg