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In Fig the block are at rest a force of ...

In Fig the block are at rest a force of `10 N` act on the block of `4 kg` mass .The coefficient of staic friction and the coefficient of kinetic friction are `mu_(s) = 0.2 and mu_(s) = 0.15` for both the surface in contact The magnitudeof frcition force acting between the surface of contact between the `2 kg` and `4 kg` block in this situation is

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