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r = 25 cm = 0,25 m
m = 5 Kg
a = ..............?
Penyelesaian :
Anggap katrol adalah silnder pejal, sehingga k = ½
ΣF = Σma
mg = (m + kM) a
5 • 10 = (5 + ½(10) • a
50 = (5 + 5) • a
50 = 10a
a = 50/10
a = 5 m/s²
Jadi, percepatan benda adalah 5 m/s²