Carbon-14 (4c), which has a half-life of approximately 5,730 years, decays into nitrogen-14 (14N). The following data table shows how the amount of 14C in a certain plant changes over time. How long will the
plant have been dead after 2 half-lives have passed?

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.