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Vy = 18 - 10t
ry = ∫ Vy dt
ry = roy + ∫ (18 - 10t) dt
ry = 1,5 + 18t - 5t²
untuk t = ½ s
ry = 1,5 + 18 · ½ - 5 (½)²
= 1,5 + 9 - 1,25
= 9,25 m
Posisi benda setelah t = ½ s
r(½) = (4 m; 9,25 m) ← jawaban
CATATAN:
Persamaan Vy = 18 - 10t, berarti
Vo = 18 m/s
g = 10 m/s²
Ho = 1,5 m
y = Ho + Vo t - ½ g t²
y = 1,5 + 18 · ½ - ½ · 10 · (½)²
y = 1,5 + 9 - 1,25
y = 9,25 m ←
Ok ?