On a spacecraft two engines fire for a time of 479 s. One gives the craft an acceleration in the x direction of ax = 4.72 m/s2, while other produces an acceleration in the y direction of ay = 7.42 m/s2. At the end of the firing period, the craft has velocity components of vx=3305 m/s and vy=4595 m/s. Find the magnitude and direction of the initial velocity. EXpress the direction as an angle with respect to the +x axis.