One of the engineers on your team performs a presentation to a perspective client about a proposed design. In answering questions, the engineer reveals that she does not agree with the way in which this system is engineered during the presentation. What are your options as the project manager of the engineer, listening to the presentation

A．Immediately stop the engineer and do damage contro

B．Ask the engineer to explain the discrepancy and what recommendation she can offe

C．Communication an openness to the problem and lead a discussion to resolve the issue

D．Rephrase the problem to ensure that everyone understands the various major points, and solicit input from everyon

如图所示，一粗糙的水平轨道靠在半径为R="0.2" m的1/4光滑圆弧轨道右侧，光滑圆弧轨道固定，水平轨道处在光滑的水平面上，可自由滑动。一质量m="1" kg的滑块（可视为质点）从A点正上方H="3" m处自由下落经圆弧轨道最低点B进入水平轨道．滑块在水平轨道上滑行1 s后离开轨道。已知水平轨道质量M="5" kg，轨道面离地面高h="1.8" m，滑块与水平轨道间的动摩擦因数μ=0.5．（取g="10" m/s²）.求：

（1）滑块到达B点时对轨道的压力； 

（2）水平轨道的长度；

（3）滑块落地时，它与水平轨道右端的水平距离。