A tennis player places a 57 kg ball machine on a frictionless surface. The machine fires a 0.055 kg tennis ball horizontally with a velocity of 35 m/s toward the north. What is the final velocity of the machine? Answer in units of m/s

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.