a uniform ladder of lenght 10cm rest aginst a smooth vertical wall the lower end of ladder is at a distance of 8m from the wall how far up a man weighing 60kg can go up the ladder before it start sliping if the weight of ladder is 40kg and coefficient of friction between the ladder and the ground is 0.4

M= Mass of Man
m= mass of ladder
l= half of length of ladder
l`= length upto which man can climb
N= Reaction force by ground
R= Reaction force by ground