4. Fig. shows apparatus that demonstrates how a coin and a piece of paper fall from rest under gravits piece of paper o coin tube containing air A Fig. 4 (a) State the initial value of the acceleration of the coin as it falls from rest. Initial velocity of the will be o when fa Coin (b) The coin and paper are at the positions shown in Fig. 4. Explain, in terms of the forces acting, why (i) the paper falls with constant speed,​

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.