Mario, a hockey player, is skating due south at a speed of 7.1 m/s relative to the ice. A teammate passes the puck to him. The puck has a speed of 12.9 m/s and is moving in a direction of 20° west of south, relative to the ice. What are the magnitude and direction (relative to due south) of the puck's velocity, as observed by Mario? Vpi + V mi = V pm I basically have no idea how to even set up this problem, because i don't understand how the puck could be passed to him at 20 degrees west of south when he is going south. But I did 12.9 cos 20 = 59.64 degrees and 12.9 - 7.1 = 5.8 m/s for the velocity and its obviously wrong.