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160 = 5y4y / 2
320 = 20y²
y² = 320/20
y² = 16
y = √16
y = 4
Tinggi = 4 * 4
= 16 cm
160=1/2 a x 4
160= 2a
80=a
L=1/2 at
160 = 1/2 5 x t
80= 5t
16= t