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Block A of mass 2kg is placed over a blo...

Block `A` of mass `2kg` is placed over a block `B` of mass `8kg` . The combination is placed on a rough horizontal surface. If `g=10ms^(-2)` , coefficient of friction between `B` and floor `=0.5`, coefficient of friction between `A` and `B=0.4` and a horizontal force of `10N` is applied on `8kg` block, then the force of friction between `A` and `B` is.

A

`100N`

B

`50N`

C

`40N`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
`f=mur=mumg|m` is mass of the combination
`f=0.5xx10xx10N=50N`
so, a force of `10N` is unable to start the motion of the system. There is no relative motion between `A` and `B` .
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