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v0 = 72km/jam = 20m/s
a = -0,5m/s^2 (negatif berarti perlambatan)
ditanya = jarak
t = v / a
t = 20 / 0,5
t = 40s (waktu yang dibutuhkan pesawat untuk berhenti)
s = v x t
s = x t
s = x 40
s = 400m
^_^