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25. A 1.0 kg mass is attached to the end of a vertical ideal spring with a force constant of 400 N/m. The mass is set
in simple harmonic motion with an amplitude of 10 cm. The speed of the 1.0 kg mass at the equilibrium
position is
(A) 2 m/s
(B) 4 m/s
(C) 20 m/s
(D) 40 m/s
(E) 200 m/s

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