The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.<br>A:decelerating when lowering the load<br>B:decelerating when raising the load<br>C:lowering the load at constant speed<br>D:raising the load at constant speed

The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.
A:decelerating when lowering the load
B:decelerating when raising the load
C:lowering the load at constant speed
D:raising the load at constant speed

出自：海船船员证

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