I have a test tomorrow for my physics class can you help me?

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 A mass of 40.0 grams is attached to a vertical spring with a spring constant k = 20.0 N/m and lowered slowly until the spring stops stretching. How much does the spring stretch? 

May 14th, 2015

This is a problem of forces and not of energy because the weight is lowered slowly. 
k*x = m*g which gives 
x = 40*10^-3 * 9.8 / 20 = 0.0196 m

May 14th, 2015

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May 14th, 2015
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May 14th, 2015
Aug 21st, 2017
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