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dik : F1= 15 N arah kiri
F2= 10 N arah kiri
F3= 20 N arah kanan
m= 5 kg
dit: a?
∑F = m . a
(F1+F2)-F3= 5. a
(15+10)-20= 5a
25 - 20 = 5a
5 = 5a
a = 1 m/s²