Posted by help on Tuesday, November 23, 2010 at 6:16pm.
All of the stored potential energy of the spring, (1/2)kX^2, winds up as heat. X is the spring compression, which they don't tell you.
You can compute the heat generated another way:
Friction work = M*g*Uk*X = 66.9 J
What is the original compression distance of the spring?
Thought it would be zero but that isn't right.
You can calculate the spring compression X from
66.9 J = (1/2)kX^2, but you don't need it. 66.9 J is the thermal energy increease.
They gave you more information than you need to answer the question
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