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The blocks ...

Question

The blocks $A$ and $B$ are arranged as shown in the figure. The pulley is friction less. The mass of $A$ is $10 K g$ . The coefficient of friction of $A$ with the horizontal surface is $0.20$ The minimum mass of $B$ to start the motion will be

A

2 K g

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B

0.2 K g

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C

5 K g

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D

10 K g

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Solution

The correct option is A $2 K g$
$T = μ_{s} M A g$
$T = M_{B} g$
$μ_{s} = \frac{M_{B}}{M_{A}}$
$0.2 = \frac{M_{B}}{10}$
$M_{g} = 2 K g$

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