An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 550 N in that rope?
A、1.4m;
B、2.0m;
C、2.5m;
D、2.7m;
E、3.7m;
F、1.7m
发布时间：2025-10-17 08:27:30
