A spacecraft is traveling with a velocity of v0x = 4920 m/s along the +x direction. Two engines are turned on for a time of 749 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 2.58 m/s2, while the other gives it an acceleration in the +y direction of ay = 8.03 m/s2. At the end of the firing, what is a) vx and b) vy? (a) Number Units (b) Number Units