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Verified answer
Ke timur = 200 mke barat = 80 m
Jarak tempuh = 200+80 = 280 m
Perpindahan = 200-80 = 120
Total waktu = 140 s
Kelajuan = Jarak tempuh/total waktu
= 280/140 = 2 m/s
Kecepatan = perpindahan/total Waktu
= 120/140
= 6/7 m/s ke arah Timur