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g = 9,8 m/s²
t = 2 seg.
a). d = Vo t - (0,5) g t²
d = (20)(2) - (0,5)(9,8)(2²)
d = 40 - 19,6
d = 20,4
---> d = 20,4 m
b). V² = (Vo)² - 2 g d
V² = (20)² - 2 (9,8) (20,4)
V² = 400 - 399,84
V² = 0,16
V = 0,4
----> V = 0,4 m/s
c). Ymax = Vo (ts) - (0,5) g (ts)²
ts = Vo / g = 20/9,8 = 2,04
ts = 2,04 seg.
Ymax = (20)(2,04) - (0,5)(9,8)(2,04)²
Y max = 40,8 - 20,4
Ymax = 20,4
----> Y max = 20,4 m
d). tv = 2ts
tv = 2(2,04)
tv = 4,08
----> tv = 4,08 seg.