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This question is from University Physics 11th edition ques. 7.73 from Chapter 7.

I have been trying to do this question for like 3 hours and is sarting to piss me off . I am using the formula:

(PEb + PEs + KE)i + Wother = (PEb + PEs + KE)f

PEb= pot. enery. of block

PEs =pot. energy of spring

Woher= work other

i= initial

f= final

Since there is no kE initial i said its 0 and since there is PEb & PEs final i said its 0. So I hae

mgxsintheta + PEs + μmgcostheta = (1/2) mv^2

Plugged in values and tried to solve for PEs but can't get 119J. I have simiar problem due (with the values different) that is due in about a hour and half. So need help fast!