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the ratio of magnitude of work done in moving slowly a block of mass m on a rough inclined surface of inclination 45 degree from bottom to top and from top to bottom is 5. the coefficient of friction between the block and surface is
(a)1/2
(b)2/3
(c)2/5
(d)4/5
let answer=k
(sin45 +kcos45)=5|kcos45-sin45|
C)2/5
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