A spacecraft is traveling with a velocity of v0x = 6150 m/s along the +x direction. Two engines are turned on for a time of 918 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.85 m/s2, while the other gives it an acceleration in the +y direction of ay = 8.37 m/s2. At the end of the firing, what is a) vx and b) vy?