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t = 80 × 1/2V2
t=40×1,4 (akar 2~1,4)
t=56m
mengggunakan phytagoras
x² + x² = 80²
2 x² = 6400
x² = 3200
x = √16 x 2 x 100
x = 4 x 10 √2
x = 40 x 1,41
x = 56