9 . a . 3.53 m/s
b . v1 = 3.2 m/s v2 = 0.2 m/s (in magnitude)
c . 45 m
d. 4.33 X 10 ^ 4
10. a . time lost = 3.88 s
b . ice remaining = 72.5 g and ice melts = 27.5 g
c . 15 %
11. f1 = 26.66 cm f2 = -80 cm
12. 100 ยตF
