Amy wants to know whether or not an item will float when placed in a fluid. which of the comparisons below, when true, will mean that the item will float? a. the object is made of stone or metal, which always sink. b. the force of gravity is stronger than the buoyant force. c. the buoyant force is stronger than the force of gravity. d. the mass of the item is greater than its gravity.

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.