A spacecraft is traveling with a velocity of v0x = 4990 m/s along the +x direction. Two engines are turned on for a time of 947 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 2.32 m/s2, while the other gives it an acceleration in the +y direction of ay = 8.34 m/s2. At the end of the firing, what is a) vx and b)vy ? (a) Number Units (b) Number Units