A 7.00 kg mass hanging from a spring scale is slowly lowered onto a vertical spring, as shown in the figure. I got the first part, What does the spring scale read just before the mass touches the lower spring? wich was, 68.6 N Dont understand how to approch, The scale reads 20.0 N when the lower spring has been compressed by 1.50cm . What is the value of the spring constant for the lower spring?....i know im trying to find k and also, At what compression length will the scale read zero? wouldnt this be when the mass is all the way on the spring?