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x = t³ - 6t² + 3t + 4
velocity = dx/dt = 3t² - 12t + 3
acceleration = d(3t² - 12t + 3 )/dt
= 6t - 12
when acceleration = 0
6t - 12 = 0
t = 2 s
velocity = 3 x 2² - 12 x 2 + 3
= 12 - 24 + 3
= -9 m/s
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