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Physics: Spring Scale Question

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A 6.30 kg mass hanging from a spring scale is slowly lowered onto a vertical spring, as shown in the figure (*please see attachment)
A. What does the spring scale read just before the mass touches the lower spring?
B. The scale reads 16.0 N when the lower spring has been compressed by 2.70 cm. What is the value of the spring constant for the lower spring?
C. At what compression length will the scale read zero?

*(Please see attachment for diagram)

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