Which of these examples shows a correlation?
a)lack of sleep causes people to struggle focusing.

b)grass makes people sneeze.

c)people like dogs more than they like cats.

d)it's possible that the more time someone looks at a screen, the worse their
eyesight could become.

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.