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Block A of mass 2kg is placed on block B...

Block A of mass `2kg` is placed on block B of mass `8kg`. For surface between A and B, `mu` is 0.2 and for surface between B and ground `mu` is 0.5. If a horizontal `25N` force is applied , the force of friction between A and B is:

A

`7200J//kg.^(@)C`

B

`7800J//kg.^(@)C`

C

`7500J//kg.^(@)C`

D

None of these

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