At time t = 0, the position vector of a particle moving in the x-y plane is r = 4.62i m. By time t = 0.011 s, its position vector has become (4.84i + 0.54j) m. Determine the magnitude Vay of its average velocity during this interval and the angle made by the average velocity with the positive x-axis.

At time t = 0, the position vector of a particle moving in the x-y plane is r = 4.62i m. By time t = 0.011 s, its position vector has become (4.84i + 0.54j) m. Determine the magnitude Vay of its average velocity during this interval and the angle made by the average velocity with the positive x-axis.