A particle moves in the xy plane with constant acceleration. At time zero, the particle is at x = 49 m, y = -36 m, and has velocity v = 3 m/s i + 9 m/s j. The acceleration is given by the vector a = 37 m/s2 i + 26 m/s2 j. (a) Find the velocity vector at t = 3 s. m/s i + m/s j (b) Find the position vector at t = 2 s. m i + m j Give the magnitude and direction of the position vector. m ° (from the +x-axis)