Answers: 2
![m=30+30+20\\m= 80 [kg]](/tpl/images/1009/1423/caf8a.png)
![w=80*9.81\\w=784.8[N]](/tpl/images/1009/1423/38089.png)
![W=784.8*0.9\\W=706.41[J]](/tpl/images/1009/1423/4452f.png)
![P=W/t\\P=706.41/0.5\\P=1412.82[W]](/tpl/images/1009/1423/1d8a7.png)
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