Meriam, Kraige & Bolton — Kinematics of Particles: Problem 2_47

2/47 At time \( t = 0 \), the position vector of a particle moving in the \( x \)-\( y \) plane is \( \mathbf{r} = 5\mathbf{i} \) m. By time \( t = 0.02 \) s, its position vector has become \( 5.1\mathbf{i} + 0.4\mathbf{j} \) m. Determine the magnitude \( v_{av} \) of its average velocity during this interval and the angle \( \theta \) made by the average velocity with the positive \( x \)-axis.