Correct Answer - C
`N_(1) = mg = (M)/(l) xg = lambda gx`
`N_(2) = F_("thrust") = v_("red") (dm)/(dt)`
`= v (dm)/(dx) xx (dx)/(dt)`
`= v^(2) (dm)/(dx) = lambdav^(2)`
`N_(2) = 2 lambda gx`
`N_("total") = N_(1) + N_(2) 3 lambda gx`
Also, `tan theta = (b)/(a)`