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=
=
= 1,1 π rad/s
ωt = ωo - α .t
0 = 1,1 - α . 20
20.α = 1,1
α = 1,1 : 20
α = 0,055 rad/s²
b) θ = ωo. t - .α .t²
= 1,1 .20 - .0,055 . 20²
= 22 - 11
= 11 π rad
= 11 x putaran
= 5,5 putaran
ket : 1 putaran = π rad