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v = x/t = x2 - x1 / t2- t1
= [3(2)² - 4(2) + 36 - 3(0)² - 4(0) + 36] / 2-0
= (12 - 8 + 36 - 36) / 2
= 4 / 2 = 2
(b).
v = Δx/Δt
v = [(3 x 3² - 4 x 3 + 36) - (3 x 1² - 4 x 1 + 36)]/(3 - 1)
v = 8 m/s