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fo = 120 rpm = 120/60 = 2 Hz
ft = 660 rpm = 660/60 = 11 Hz
t = 8 s
α = __ ?
ωo = 2π fo = 2π (2) = 4π rad/s
ωt = 2π ft = 2π (11) = 22π rad/s
ωt = ωo + α t
22π = 4π + α (8)
18π = 8α
α = 18/8 = 2,25 rad/s² ← jawaban
Ok ?