A robotic arm is designed for 3D printing. The length of the robotic arm to its end effector varies according to r(0) = (0.5 +0.25[1- cos(20)]) m. If the robotic arm is rotating at a constant angular speed of 0.5 rad/s. Estimate the magnitude of the velocity and acceleration of the end effector of the robotic arm when 0 = 45.