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θ = (2t² - 4t² - 2t) rad
r = 2 m
Dit :
v = ...? t =2s
Peny :
v = dθ/dt
= d/dt (2t² - 4t² - 2t)
= 4t - 8t - 2
t = 2s
v = 4t - 8t - 2
= 4(2) - 8(2) - 2
= 8 - 16 - 2
= -10 rad/s
kecepatan linear
v = ω.r
= -10 . 2
= -20