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Answer: 4/3 =1.33333
Explanation:
regardless of acceleration of frame of reference (elevator in this case),
if block is not moving then,
μ = tanΦ
μ = tan53 = 4/3 = 1.3333
If you are interested in proof, you can watch it here
https://www.youtube.com/watch?v=LH1--T1g3wY
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