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Verified answer
Ym = 40 m
t = __?
Ym = Vo² sin²α / g
40 = (Vo sin α)² / 10
400 = (Vo sin α)²
Vo sin α = 20 m/s
waktu untuk mencapai titik tertinggi
t = Vo sin α / g
t = 20 / 10
t = 2 s ✓
waktu untuk jatih kembali ke tanah = 2 t = 4 s ✓