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m = 200 kg
g = 10 m/s²
R = 20 m
μs = ½
v = 18 km/jam = 5 m/s
Kecepatan maksimum
vm = √(μs g R)
vm = √(½ · 10 · 20)
vm = 10 m/s
karena v < vm, mobil belum tergelincir ←
Gaya gesekan
fs = μs N
fs = μs mg
fs = ½ · 200 · 10
fs = 1000 N ←
Jawaban [b]