A spacecraft is traveling with a velocity of Vox = 6690 m/s along the +x direction. Two engines are turned on for a time of 939 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.38 m/s2, while the other gives it an acceleration in the ty direction of ay = 7.24 m/s2. At the end of the firing, what is a) vx and b) vy? (a) Number i Units (b) Number i Units