1. The problem statement, all variables and given/known data Useful background for this problem can be found in Multiple-Concept Example 2. On a spacecraft two engines fire for a time of 871 s. One gives the craft an acceleration in the x direction of ax = 6.00 m/s2, while the other produces an acceleration in the y direction of ay = 5.68 m/s2. At the end of the firing period, the craft has velocity components of vx = 5800 m/s and vy = 6420 m/s. Find (a) the magnitude and (b) the direction of the initial velocity. Express the direction as an angle with respect to the +x axis. 2. Relevant equations most likely the use of the 4 main kinematics equations v2=v1+at v2^2=v1^2+2ad x=1/2(v1+v2)t x=v1t+1/2at^2 3. The attempt at a solution basically i have no idea where to begin in this question, its computer question and I keep getting the incorrect answer, if anybody has suggestions how to begin this problem that would be nice, like what wud i do with that time of 871 s?