Jawabanmu

2014-08-22T19:17:07+07:00
20 . (1,5.60)
20 . 90
1800
2400+1800= 4200
2 3 2
2014-08-22T19:27:09+07:00
Vt = V0 + a.t
vt = 2400m/s +20m/s2 × 90s
vt = 2400m/s + 1800m/s
vt = 4200m/s
7 3 7