Question

as shown in the figure M is a man of mass 60 kg is standing on a block of mass 30 kg kept on a ground.The coefficient of friction between the feet of the man and the block is 0.3 and that between B and the ground is 0.1 if person pulls the string with 100 Newton force

Answer 1

I guess that the answer is....
Option C: the friction force acting between A & B will be 40 Newton force...

Hope this helps you...