question_answer

If the over bridge is concave instead of being convex. The thrust on the road at the highest position will be :

A) \[\frac{{{m}^{2}}{{\upsilon }^{2}}g}{r}\]

B)                        \[\frac{{{\upsilon }^{2}}g}{r}\]                   

C) \[mg+\frac{m\upsilon }{r}\]       

D)        \[mg-\frac{m{{\upsilon }^{2}}}{r}\]