Points: 0 of 1 At time t= 0, a particle is located at the point (1,6,3). It travels in a straight line to the point (5,2,5), has speed 6 at (1,6,3) and constant acceleration 4i - 4j + 2k. Find an equation for the position vector r(t) of the particle at time t. The equation for the position vector r(t) of the particle at time t is r(t) = ( Dit (Di+ ()k. (Type exact answers, using radicals as needed.)