[填空题]
The position of a rabbit along a straig4fb/mpb3u u: xht tunnel as a wdes)/87wci hfunction of time is plotted in Fig. 2–28. What is its instantaneous velocity
dhe7)8 wwcs/ i (a) at t = 10.0 s m/
(b) at t = 30.0 s What is its average velocity m/s
(c) between t = 0 and t = 5.0 s m/s
(d) between t = 25.0 s and t = 30.0 s m/s
(e) between t = 40.0 s and t = 50.0 s ? m/s