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A spring (k = 120 N/m) is arranged horizontally up against a wall. A 7.5-kg block...

A spring (k = 120 N/m) is arranged horizontally up against a wall. A 7.5-kg block is sitting on the floor and pushed back against the spring, compressing it 0.321 m. The floor is frictionless. The block is then released, allowing the spring to uncompress.

a.) What is the initial acceleration of the block?

b.) As the block keeps moving, what happens to its acceleration and why? Explain in a sentence or two.

c.) As the block keeps moving, what happens to its speed and why? Explain in a sentence or two.

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