(1)υ=s/t=15m/20s=0.75m/s
(2)G=mg=60kg×10N/kg=600N,W=FS=Gh=600N×15m=9×10 3J,P=W/t=9×103J/20s=450W (3)减轻体重 加强体能训练 穿(戴)防滑鞋(手套) 轻装上阵等
(1)υ=s/t=15m/20s=0.75m/s
(2)G=mg=60kg×10N/kg=600N,W=FS=Gh=600N×15m=9×10 3J,P=W/t=9×103J/20s=450W (3)减轻体重 加强体能训练 穿(戴)防滑鞋(手套) 轻装上阵等