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**1. Homework Statement**

http://img521.imageshack.us/img521/4360/physicsjg1.jpg [Broken]

**2. Homework Equations**

Elastic Energy = 0.5 x k x X²

Kinetic Energy = 0.5 x m x V²

**3. The Attempt at a Solution**

At 1m i worked out there is 1.922J of energy (0.5 x 10 x 0.62²) stored in the spring. Since no energy is lost and initially the spring has no energy i assume it must be:

Initial Kinetic Energy = Final Elastic Energy

Initial Kientic Energy = 1.922J

0.5 x m x V² = 1.922

0.5 x 10 x V² = 1.922

5 x V² = 1.922

V² = 0.384

V = 0.634 m/s

The answer however should be 0.876 m /s. Can someone please help me see where i have gone wrong?

James

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