Answer:0.558 m
Explanation:
Given
weight of Plank=228 N
weight of man=449 N
Length of plank=4.4 m
let [tex]R_a[/tex] and [tex]R_b[/tex] be the reactions at A & B
and Reaction at A becomes zero when plank is about to rotate at B
Taking moment about B at that instant so that plank is just about to rotate.
[tex]228\times 1.1=449\times x[/tex]
Where x is the maximum distance that man can walk
x=0.558 m
