The minimum acceleration that must be impprted to the cart in the figure so that the block `A` will not fall (given `mu` is the coefficient if friction between the surface of block and cart) is given by:

Options

A. `mug`
B. `mu//g`
C. `g//mu`
D. none

Answer

C

Explanation

Solving from the frame of cart, we get
`N=ma, mg =mu N rArr mg =mu ma`
`rArr a=g/(mu)`