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$\;\alpha $ > $\frac{{mg}}{\mu }$
  • B$\;\alpha $ > $\frac{g}{{\mu m}}$
  • C$\;\alpha $ $ \ge $ $\frac{g}{\mu }$
  • D$\;\alpha $ < $\frac{g}{\mu }$
AIPMT 2010, Medium
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