You perform an experiment to measure the speed of a car over time. The results are shown in the graph below.

What is the best inference for the speed of the car after 3 seconds?

A. 19 m/s

B. 17 m/s

C. 21 m/s

D. 14 m/s

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.