Paul’s 10 kg baby sister susan sits on a mat. paul pulls the mat across the floor using a rope that is angled 30° above the floor. the tension is a constant 30 n and the coefficient of kinetic friction is 0.20. use work and energy to find susan’s speed after being pulled 3.0 m.

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.