A hockey puck (1) of mass 180 g is shot west at a speed of 8.40 m/s. It strikes a second puck (2), initially at rest, of mass 144 g. As a result of the collision, the first puck (1) is deflected at an angle of 38° north of west and the second puck (2) moves at an angle of 40° south of west. What is the magnitude of the velocity of puck (1) after the collision?