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3.
fs = μs . N
60 = μs . 100
μs = 60/100
μs = 0,6

4.
μk = 0,1
fk = 32 N

N = fk / μk
N = 32/0,1
N = 320 N

5.
N = 300 N
fs = 60 N

μs = fs/N
μs = 60/300
μs = 0,2