Which two statements are true of electromagnetic waves? A. They travel by causing particles of matter to vibrate.
B. They do not need a medium to transfer energy.
O C. They transfer energy by disturbing electric and magnetic fields.
D. They need a medium to transfer energy.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.