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two blocks of masses $10 k g$ and $5 k g$ are placed one over the other on a horizontal plane as shown as shown in the figure. If co-efficient of friction is $μ = 0.2$ and an external force $F = 25 N$ is applied horizontally on the lower block, then the force of friction between the two block is

$30 N$
$25 N$
$0$
None of these

A

25 N

B

0

C

None of these

D

30 N

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