일반물리학 1 — Force and Motion-I: Problem 29

29 A firefighter who weighs 689 N slides down a vertical pole with an acceleration of 2.00 m/s2, directed downward. What are the (a) magnitude and (b) direction (up or down) of the vertical force on the firefighter from the pole and the (c) magnitude and (d) direction (up or down) of the vertical force on the pole from the firefighter?