Asked by Sarah

A 0.63-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained length quadruples. What is the mass of the second block?

My work is as follows:

F=kx
mg=kx Since k is unknown, I chose to use 1

.63*9.8=1*x
x=2.52 kg

My answer is incorrect. What am I doing wrong?
Answered by Thomas
.63 x 9.8 = 6.174 not 2.52
Answered by Dawn
2.52 is the total weight. Subtract weight 1 from that to get your answer.
Answered by Sarah
Sorry, showed my work incorrectly.

.63*9.8=1x
x=6.174

then F=k4x
m*9.8=1*24.696
m=2.52
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