A migrating robin flies due north with a speed of 12 m/s relative to the air. The air moves due east with a speed of 6.1 m/s relative to the ground. What is the robin's speed relative to the ground?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.