You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 23%, you are running at the same speed she is. If your mass is 84 kg, what is her mass

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.