What are the instantaneous speeds of car A and car B at the zero-second mark?

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.