Jawabanmu

2014-09-11T15:39:01+07:00
50kmx1000=50000m
50000m/60m/s = 833.33s
2014-09-11T15:39:29+07:00
S = v x t
t = s / v 
  = 50000 / 60 = 833.33 detik = 13 menit 53 detik
percepatan = ??