Three pieces of paper are held h = 2 m above the ground in an ordinary room. The first piece is crumpled into a ball and hurled downward from 2 m with a large initial velocity. The second piece is crumpled into a ball and simply dropped. The third piece is left uncrumpled and at and also simply dropped. Part C: Suppose the crumpled ball that was simply let go experiences a constant downward acceleration of 9 m/s^2. How much time does it take for it to reach the ground?
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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.