Block A of mass 3 kg rests on another block B of mass 7 kg. The coefficient of friction between A and B is 0.4 while the coefficient of friction between B and the horizontal floor on which B rests is 0.55. Find the force of friction between A and B, when a horizontal force of 50 N is applied on the block B.
(Use g = 10 m/s2)
1
0
2
5 N
3
4 N
4
12 N