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s = (v x t) / 2
20 meter = (v x 0,12 sekon) / 2
20 meter = 0,12v / 2
40 = 0,12v
v = 333,3 m/s
s = (v x t) / 2
s = (333,3 x 0,012 sekon) / 2
s = 1,99 meter ≈ 2 meter
jadi jawabannya yang opsi B.