Jawabanmu

2014-09-01T18:24:58+07:00
Percepatan = a = \frac{v2-v1}{t}
                    a =  \frac{108-36}{5} = 72
                       =  \frac{72000}{3600} : 5 = 4

F = m . a
F = 280 . 4
F = 1120 N
2 3 2