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The force constant of a spring is 600 N/m and the unstretched length is 0.2-kg block is suspended from the spring.

The force constant of a spring is 600 N/m and the unstretched length is 0.72 m. A 3.2-kg block is suspended from the spring. An external force slowly pulls the block down, until the spring has been stretched to a length of 0.86 m. The external force is then removed, and the block rises. In this situation, when the spring has contracted to a length of 0.72 m, the upward velocity of the block is closest to:
9.1 m/s
5.1 m/s
1.0 m/s
7.4 m/s
9.7 m/s

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