A cart of mass M has a block of mass m i...

A cart of mass M has a block of mass m in contact with it as shown in the figure-2.133. The coefficient of friction between the block and the cart is `mu`. What is the minimum acceleration of the cart so that the block m does not fall ?

(a)`mu //g`

(b)`mug`

(c)`( mu M g)/( M')`

(d)`( g )/( mu )`

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