What is the frequency of a wave that has a wavelength of 0.78 m and a speed of 343 m/s?

O A. 267 Hz

B. 0.004 Hz

C. 440 Hz

D. 0.002 Hz

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.