one train is travel 120m with a velocity of 52 km and a second train is traveling in the opposite direction with a velocity of 20 m how log will it take for them to completely pass one another

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.