A 0.891 kg mass is attached to a horizontal spring. The spring is initially stretched by 0.139 m and the mass is

A 0.891 kg mass is attached to a horizontal spring. The spring is initially stretched by 0.139 m and the mass is

released from rest there. After 0.344 s, the speed of the mass is zero (for the first time after being released). What is the maximum speed of the mass? Answer in units of m/s. 

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