2. [PSE6 4.P.005.] At t = 0, a particle moving in the xy plane with constant acceleration has a velocity of vi = (3.00 i - 2.00 j) m/s and is at the origin. At t = 2.80 s, the particle's velocity is v = (9.10 i + 8.50 j) m/s. (a) Find the acceleration of the particle at any time t. (Use t, i, and j as necessary.) Got this one (b) Find its coordinates at any time t. x = ( ) m y = ( ) m Don't get these two.