Two bodies A and B of masses `10 kg and 5 kg` placed very slightly seperated as shown in figure The coefficient of friction between the floor and the block are as `mu_(s) = 0.4` block A is pushed by an external force F The value of F can be changed when the weight between block A and ground breaks block A will start prssing block B will start pressing the vertical wall

If `F = 50N `the friction force acting between block B and ground will be

Options

A. `10N`
B. `20N`
C. `30N`
D. None

Answer

a

Explanation

If` F = 50 N` force on `5kg` block`= 10N`

so friction force`= 10 N`