Answer 26th question

Solution:
To hold body stationary, force required: F1 =mgsinθμmgcosθ The force required to body move up is given by, F2  =mg(sinθ+μcosθ) F2=3×F1   θ=300 mg(sinθ+μcosθ)=3mg(sinθμcosθ) 2mgsinθ=4mgμcosθ tanθ=2μ= 13   θ=300

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