to find @ the angle of banking: the eqn for eqbm of vehicle in absense of friction: (v^2/r)cos@=mgsin@ tan@=1/2 now friction comes in to the pic friction can act upward or downwards so 2 cases 2 move neithe up or down,eqbm eqn give: (mv^2/r)cos@ +(or - ) (mgcos@+(mv^2/r)sin@)=mgsin@ we get v^2/r=7 or 3
hence v=root(60) or root(140)-edited after the correction im gettimg same as varun the value of N is N=mgcos@ +(mv^2/r)sin@