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force required to prevent the body from sliding
F=mgsinθ-µmgcosθ
force required to just move the body up
F1=mgsinθ+µmgcosθ
it is given
F1=2f
mgsinθ+µmgcosθ=2(mgsinθ-µmgcosθ)
0r 3µmgcosθ=mgsinθ
tanθ=3µ
Hence tanθ = 3 *0.25 = 0.75 = 3/4
Hence
θ = tan^-1 (3/4)
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