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x pada (t = 1) = 2.1kuadrat - 3.1 - 2 = -2
x pada (t=2) = 2.2kuadrat - 3.2 -2 = 0
v = 0 - (-2) / 2-1 = 2 m/s
8. rumus : v = dr/dt = dr ∫ (2t² - 3t - 3) dt= (2/2+1) . t (pangkat 2+1) + (4/1+1).t (pangkat 1+1) + (3/0+1).t (pangkat 0+1)= 2/3t (pangkat 3) + 2t (kuadrat) + 3t = t diganti dengan 1 = 2/3 + 2 + 3 = 5,7 m/s