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m = 5000kg
t = 50 s
vt = 72 km/jam = 20 m/s
ditanya : F =?
jawaban: vt = v0 + a.t
20 m/s = 0 m/s + a. 50s
20 m/s = 50s . a
a = 20 m/s / 50s
a = 0,4 m/s²
F = m .a = 5000 kg . 0,4 m/s² = 2000 N