The lengths of smooth & rough inclined planes of inclination 45^(@) is same. Times of sliding of a body on two surfaces is t_(1),t_(2) and mu=0.75, then t_(1),t_(2)

The lengths of smooth & rough inclined planes of inclination 45^(@) is

1.	The lengths of smooth & rough inclined planes of inclination 45^(@) is same. Times of sliding of a body on two surfaces is t_(1),t_(2) and mu=0.75, then t_(1),t_(2)
Answer» `2:1` `2:3` `1:2` `3:2` SOLUTION :`t_("smooth")=sqrt((2L)/(g SIN THETA)),t_("ROUGH")=sqrt((2l)/(g(sin theta-mu_(k)cos theta)))`