3. A stationary 15.0 kg ceramic disk shatters on a horizontal sheet of frictionless ice into three separate pieces. Piece 1 with a mass of 4.0 kg has a velocity of 15 m/s [N 30° W] and piece 2 with a mass of 5.0 kg has a velocity of 18 m/s [S], both immediately after the disk shatters. Find the velocity of piece 3immediately after the disk shatters.

Fig: 1