15. a girl pushes a box that has a mass of 85 kg up an incline. if the giri exerts a force
of 200 n along the incline what is the mechanical advantage of the incline?

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.