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s'(t)= 0
2/3 t + 9t² - 4 = 0
27t² + 2t - 12 = 0
t = 1/27 ( 5√13 -1) = 1/27(17,08) =0,63
V(t) = 1/3 (0,63)² + 3(0,63)³ - 4(0,63) = 9,52