Jawabanmu

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2014-08-26T12:49:24+07:00
F = m. a

v = 18km/jam = 5m/s
a = vt - vo / t
   = 5 - 0 / 30
   = 1/6 m/s²

m= 3 ton = 3000 kg

F = m .a
= 3000 . 1/6
= 500 N
2 4 2