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In the track shown in figure section `AB` is a quadrant of a circle of `1` meter radius. A block is released at `A` and slides without friction until it reaches `B`. After B it moves on a rough horizontal floor and comes to rest at distance `3` meters from B. What is the coefficient of friction between floor and body? A. `1//3`B. `2//3`C. `1//4`D. `3//8` |
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Answer» Correct Answer - A `mg1=(1)/(2)m u_(2)rArr u_(2)=2g`...(1) `v_(2) =u_(2)+2as rArr 0=2g-2a(3)` `rArr a=(g)/(3) rArr mu_(k) g=a` `:. mu_(k) g = (g)/(3)` `:. u_(k) = (1)/(3)` |
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