A Horizontal, 10-M Plank Weighs 100 N

Multiple Choice

A horizontal, 10-m plank weighs 100 N.It rests on two supports that are placed 1.0 m from each end as shown in the figure.How close to one end can an 800-N person stand without causing the plank to tip?

A) 0 m
B) 0.3 m
C) 0.5 m
D) 0.7 m
E) 0.9 m