A body of mass m is launched up a rough inclined plane of angle 45∘ with the horizontal. If the time of ascent is half the time of descent in covering the same distance, the coefficient of friction is
A
25
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B
35
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C
34
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D
58
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Solution
The correct option is B35 Up the plane:
F=ma⇒(mgsinθ+f)=ma1 mgsinθ+μmgcosθ=ma1 a1=g(sinθ+μcosθ) s1=ut+12at2 (u is the initial velocity) s1=12g(sinθ+μcosθ)t21;
Down the plane: