Ch. 2 Homework, Phy 131, Fall 1997, Tulane

2.1   (a) 6.7 m/s  (b) -3.3 m/s  (c) 0   (d) 4.4 m/s

2.10  (a) 1.4 x 10^8 s (4.3 years)    (b) 44,000 years

2.12  (a) v1 > v2, s1 > s2   (b) v1 = v2, s1 = s2
      (c) v1 < v2, s1 > s2   (d) v1 > v2, s1 < s2

2.19  (a) v = 80 m/s   (b) x = 400 m    (c) vavg = 40 m/s

2.22  v = 3 m/s,   t = 0.5 s

2.31  (a) 0    (b) 1/3 m/s   (c) -2 m/s   (d)  1 m/s

2.35  (a) 6 s   (b) 5 s  (c) 5 s  (d) above 10 s  (e) 0-3, 7-10 s  (f) 3-7 s

2.42  (b) 15 s  (c) 300 m

2.60  (b) d = 13 m  (c) assuming reaction time 0.2 s, d = 13m + 2.5m = 15.5 m