Ein Bauarbeiter will eine Kabel- rolle (m = 200 kg) um 2 m nach
oben transportieren. Er kann
beim Rollen eine maximale
Hangabtriebskraft von 500 N
aufbringen. Welche Länge
muss das Brett für die geneigte
Ebene haben ?

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.