A mass of 0.75 kg is attached to a spring and placed on a horizontal surface. The spring has a spring constant of 180 N/m, and the spring is compressed 0.3 m past its natural length. If the mass is released from this compressed position, what is the speed of the mass as it passes the natural length of the spring?
A. 4.6 m/s
B. 0.83 m/s
C. 3.8 m/s
D. 2.1 m/s

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Can you help with filling in the variables? I'm really confused.

@CShrix

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