A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v_0x = +2.8 m/s and a_x = +8.1 m/s². The y components of the puck's initial velocity and acceleration are v_0y = +7.7 m/s and a_y = -5.4 m/s². Find (a) the magnitude v and (b) the direction of the puck's velocity at a time of t = 0.50 s. Specify the direction relative to the +x axis.