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Answer:

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Explanation:

x=4t^3-2t

v=dx/dt

v=3x4t^2 - 2

v=12t^2 -2

0=12t^2-2

12t^2=2

t^2=1/6

t=1/√6sec

v=at

a=v/t

a=10√6 m/s^2