A75 n force pulls a child and a sled initially at rest down a snowy hill. if the combined mass of the child and sled is 55 kg, what is their speed after 7.5?

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.