Here are the solutions to the homework problems, so you can check your work:
- #19: v f golf ball = 0.65 m/s
- #20: (a) v f rifle = 0.49 m/s; (b) v f man & rifle = 0.020 m/s
- #21: (a) v f girl = 1.15 m/s; (b) v f plank = 0.346 m/s opposite the girls motion
- #25: v f arrow = 1.67 m/s
- #27: (a) v f cars = 1.8 m/s; (b) K lost = 2.16×104 J
- #28: v i bullet = 529 m/s
- #29: height bullet & ball = 57 m
- #31: v f Gale & bro & sled = 15.6 m/s
Tomorrow we will look at collisions in two dimensions!