Air resistance When a body reaches V, Both forces are equal in magnitude F d but mg So the coefficient b is 79 mg And d =m t. e 6 0 The terminal speed v, varies mass, shape, size Feather: 0.5 m/s Raindrop 7m/s Skydiver: 50-60 m/s(spread-eagle Skydiver: 100 m/s diving) Physics 121: Lecture 5, Pg 5Physics 121: Lecture 5, Pg 5 Air resistance When a body reaches vt Both forces are equal in magnitude So the coefficient b is And The terminal speed vt varies mass, shape, size Feather: 0.5 m/s Raindrop: 7 m/s Skydiver: 50-60 m/s (spread-eagle) Skydiver: 100 m/s (diving) Fd mg vt