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7. B
8. A
9. θ = (2 rad)t³ - (3 rad)t²
v = 3(2 rad)t² - 2(3 rad)t
a = 2 . 3(2 rad)t - 2(3 rad)
= (12 rad)t - 6 rad
= (12 rad)2 - 6 rad
= 24 rad - 6 rad = 18 rad