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= V₀² sinα / 2g
= (20)² sin 90 / 2(10)
= 400 (1) / 20
= 20 Meter
(B)
H = V₀.t - ¹/₂ g t²
20 = 20 t - ¹/₂ (10) t²
t³ = √ 2(20+20) / (10)
t³ = √80/10
t = √8
t = 2 Sekon
Atau menggunakan cara selanjutnya !
t² = √2h/g
t² = √2(20) / 10
t = √4
t = 2 Sekon
t=vo/g=20/10=2 sekon