7. A wave moves at a constant speed along a string. Which one of the following statements is false concerning the motion of particles in the string?
A) The particle speed is constant.
B) The particle speed is not the same as the wave speed.
C) The particle speed depends on the amplitude of the periodic motion of the source.
D) The particle speed depends on the frequency of the periodic motion of the source.
E) The particle speed is independent of the tension and linear density of the string.​

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.