The Newton’s second law gives
ma=mg sinθ-F_frict
F_frcit=μN=μmg sinθ
So
a=g sinθ-μg cosθ
μ=(g sinθ-a)/(g cosθ )=(9.8×sin〖60°〗-3)/(9.8 cos〖60°〗 )=1.12
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