Trolley A is full of shopping, has a total mass of 8 kg and is moving at a velocity of 2 m/s with a kinetic energy of 16 J. Trolley B is empty, has a mass of 4 kg and is moving at a velocity of 0.5 m/with a kinetic energy of 0 5 J.

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.