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 = 20N`,with how much force block A press block B?

Options

A. `10N`
B. `20N`
C. `30N`
D. Zero

Answer

d

Explanation

If `F = 20 N10kg` block will not move and it will are `5kg` block so `N = 0`