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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 . The acceleration of the cart that will prevent the block from falling satisfies:
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a > mg µ -
a > g µm
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a ≥ g µ
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a < g µ
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Correct Option: C
Forces acting on the block are as shown in the fig. Normal reaction N is provided by the force mα due to acceleration 
∴ N = mα
For the block not to fall, frictional force, Ff ≥ mg
⇒ μN ≥ mg
⇒ μmα ≥ mg
⇒ α ≥ g/μ
