6. A 1.00-kg mass is attached to a horizontal spring. The spring is initially stretched by 0.100 m and the mass is released from rest
there. After 0.500 s, the speed of the mass is zero. What is the maximum speed of the mass?
(A) 0.326 m/s
(B) 0.438 m/s
(C) 0.510 m/s
(D) 0.593 m/s
(E) 0.628 m/s
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