An object m = 40 kg starts to slide on the floor under a horizontal traction force F with a speed a = 1.5 m/s2. The system of friction between the object and the floor is 0.2. take g = 10 m/s2. a) Calculate the Friction force?

b) Calculate the drag force F?

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.