Jawabanmu

2014-08-22T18:36:06+07:00
72km/jam = 20m/s
jarak = kecepatan × waktu
= 40 × 20
= 80m
2014-08-22T18:36:08+07:00
72 km/jam = 20 m/s

S = v . t
= 20 . 40
= 800 meter