h = v o · t - g t² / 2
v = v 0 - g t
0 = v o - 9.8 t
v o = 9.8 t
4.3 = 9.8 t · t - 9.8 t² / 2
4.3 = 9.8 t² - 4.9 t²
4.3 = 4.9 t²
t² = 4.3 : 4.9
t² = 0.87755
t = √ 0.87755
t = 0.93678 s
v o = 9.8 · 0.93678
v o = 9.18 m/s
Answer:
its initial vertical speed is 9.18 m/s.
