A body of mass 'm' is moving with constant speed v on a track shown in figure. At point A and point B radius of curvature is R. `N_A,N_B` and `N_C` represents normal reactions at A, B and C which of the following option is correct ?

Options

A. `N_A=mg-(mv^2)/R`
B. `N_B=mg+(mv^2)/R`
C. `N_C=mg`
D. All of these

Answer

D

Explanation

`mg-N_A=(mv^2)/R, N_B-mg =(mv^2)/R, N_C=mg`