A block of mass \( m \) is in contact with the cart \( C \) as shown in the figure. The coeffic...

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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
[CBSE PMT 2010]
(a) \( \alpha\frac{g}{\mu} \)
(b) \( \alpha\frac{m g}{\mu} \)
(c) \( \alpha\frac{g}{\mu m} \)
(d) \( \alpha \geq \frac{g}{\mu} \)
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