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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 acceleration `alpha` of the cart that will prevent the block from falling satisfies

A

`alphagtm g//mu`

B

`alphagtg//mu m`

C

`alphageg//mu`

D

`alphaltg//mu`.

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