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Q.

A block is placed on a rough horizontal plane. A time dependent horizontal force $F = Kt$ acts on the block. Here K is a positive constant. Acceleration time graph of the block is :

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a

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b

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c

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d

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answer is C.

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Detailed Solution

F = kt

$F_{net} = F - f_{r} = 0$ Up to time

$kt = μ mg = {Fr}_{1} \max$

$And for t > \frac{μ mg}{kt}$

$F_{net} = kt - μ mg$

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