W有=Gh二54Kg/NX10N/KgXh二540h，W总=(G十G轮)/3X3h=600h，机械效率=W有/W总二90%，F拉=(G十G轮)/3=200N，F压二G人十F拉二50X10十200N二700N，P=F拉V，V拉二P/F拉=180N/600N二0.3m/S，V物=VB二0.3m/SX1/3=0·1m/S
