# A block of mass 2.80 kg is placed against a horizontal spring of constant k = 805 N/m and pushed so the spring compresses by 0.0650 m. (a)What is the elastic potential energy of the block-spring system (in J)?  (b)If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring.

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A block of mass 2.80 kg is placed against a horizontal spring of constant k = 805 N/m and pushed so the spring compresses by 0.0650 m.

(a)
What is the elastic potential energy of the block-spring system (in J)?

(b)
If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring.
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Step 1

a)

The required elastic ...

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