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h = 15 m
g = 9,8 m/s²
Ditanyakan : V saat ketinggihan setengah ?\
Dijawab :
h = 15/2 = 7,5 m
Jadi kecepatan :
V² = 2gh
= 2 x 9,8 x 7,5
= 147
V = √147
V = 7√3 m/s