the three vectors A is 210m along the negative x-axis and B is 45° above positive x-axis and 180m, while C is 60° below negative y-axis and 110m find the magnitude and direction of the vector D which when you added to the three vectors will give a zero resultant​

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?