3. A particle with mass 1 kg is acted by a force F(x) = 3x²+x +1/2 along the x axis, where x is in meter and F in Newton. If the particle's speed is 0 at x=0, what is its speed at x = 1?
(A) 0
(B) 2 m/s
(C) 4 m/s
(D) 6 m/s
(E) 8 m/s

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