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Work energy theorem sys work done by all the force is equal to change in kinetic energy" In the diagram, a disc of mass `M` and radius `R `is rolling without slipping on a rough fixed inclined `AB = l, V =` velocity of disc at `B`. Choose the correct option(s)A. Total work done by frictional force `(W_(f))` is `Mg//sintheta`B. Total work done by frictional force `(W_(f))` is `(3)/(4)MV^(2)`C. Total work done by frictional force `(W_(f))` is `-Mglsintheta`D. Total work done by frictional force `(W_(f))` is zero |
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Answer» Correct Answer - A::B::C `mgl sintheta = (1)/(2)mv^(2) + (1)/(2)(mR^(2))/(2)((v)/(R))^(2)` `mgl sintheta = (3)/(4)mv^(2)` `v = sqrt((4glsintheta)/(3))` Work done by friction is `0`. |
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