1.

Two bodies `A` and `B` of masses `10kg` and `5kg` are placed very slightly separated as shown in figure. The coefficient of friction between the floor and the bloks is `mu=0.4` . Block `A` is pushed by an external force `F`. The value of `F` can be changed. When the welding between block `A` and ground breaks, block `A` will start pressing block `B` and when welding of `B` also breaks, block `B` will start pressing the vertical wall - What should be the minimum value of `F`, so that block `B` can press the vertical wallA. `20N`B. `40N`C. `60N`D. `80N`

Answer» Correct Answer - C
`F_(min)=f_(A)+f_(B)=60N`.


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