1. A 20 kg tennis ball launcher shoots a 0.057 kg tennis ball across a frietionless court. If the tennis ball's velocity after it is launched is 36 m/s to the north, what
is the velocity of the tennis ball launcher?
2 A 0.008 kg bullet going 400 m/s to the east hits a tìn can filled with sand (total
mass 5 kg) and gets stuck inside in an inelastic collision. Assuming there is no
friction, how fast is the can and the bullet) moving after the collision?
3. A 110 kg running back carries the ball south at 8 m/s. A 130 kg linebacker runs to
make the tackle going north at m/s. In their collision, the linebacker wraps his
arms around the runner and makes it an inelastie collision. How fast are they
moving right after the collision (before they fall to the ground)