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f = 600 rpm = 10 Hz
ωt = 0
α = - 5/π rad/s²
t = __ ?
Kecepatan sudut awal
ωo = 2π f = 2π(10) = 20π rad/s
Waktu henti
ωt = ωo + α t
0 = 20π + (- 5/π) t
t = 20π · π/5 = 4π² s ←
Ok, semoga cukup jelas.