Abox is placed on a table. if an upward pulling force is exactly equal to the weight of the box, what will happen to the box? a. it will remain on the table. b. it will start to fall through the table. c. it will move upward briefly and then move downward. d. it will start to rise off the table and continue speeding up.

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.