A block of mass m is in contact with the cart C as shown in the figure.

The coefficient of static friction between the block and the cart is `mu`. The acceleration a of the cart that will prevent the block from falling satisfies: A bridge is in the from of a semi-circle of radius 40m. The greatest speed with which a motor cycle can cross the bridge without leaving the ground at the highest point is

Options

A. `alpha gt (mg)/(mu)`
B. `alpha gt (g)/(mu m)`
C. `alpha gt= (g)/(mu)`
D. `alpha lt (g)/(mu)`