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Verified answer
Gerak Melingkar* Periode
v = 18 km/jam = 5 m/s
d = 0,8 m , maka R = 0,4 m
T = _ ?
ω = v / R
ω = 5 / 0,4
ω = 12,5 rad/s
ω = 2π / T
T = 2π / ω
T = 2π / 12,5
T = π / 0,16 s
atau
T = 3,14 / 0,16 = 19,625 s