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A block of mass m is in contact with the...

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 accelaration `alpha` of the cart that will prevent the block from falling satisfies:
.

A

`alphagtmg/mu`

B

`alphagtg/(mu m)`

C

`alphaoversetgt-g/(mu)`

D

`alphaltg/(mu)`

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