a roller coaster first drop is 100m above the ground. the coasters mass is 1000 kg. Use these known values to find out that the velocity of the coaster will be at the bottom of the drop. Gravity=9.8m/s , PE= m x g x h, KE=.5 x m x v^2

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.