PLEASE HELP 13. In the mesosphere (an upper portion of our atmosphere) temperatures can get very low. At -15°C the speed of sound is actually only 93% as fast as it normally would be... a) What is the speed of sound in the mesosphere? m/s

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.