James stewart, 2002 motorcross/supercross rookie of the year, is leading a race when he runs out of gas near the finish line. he is moving at 16 m/s when he enters a section of the course covered with sand where the effective coefficient of friction is 0.90. will he be able to coast through this 15-m-long section to the finish line at the end? if yes, what is his speed at the finish line?

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.