2. A 2.0 kg snowball is thrown at 18 m/s. It hits and sticks to a 5.2 kg package sitting on a porch. How fast will they now be moving? Show all your work, assume the system is closed. 3. A skater begins to spin with arms held out at shoulder height. The skater wants to match the speed of the spin to the beat of the music. How does the skater use knowledge of the conservation of momentum to do this?