Block A of mass 2kg is placed over a block B of mass 8 kg. The combination is placed on a rough horizontal surface as shown:
The contact between the blocks has a co-efficient of friction 0.4 while the contact between block B and ground has co-efficient of friction 0.5. Taking $g = 10 m / s^{2}$ , find the frictional force acting between the blocks in SI units.

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Detailed Solution

The limiting friction between block B and ground is 0.5(100 N) = 50N. So, the two blocks will remain stationary and the friction between the two blocks will remain zero.

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