N=A/t=mgh/t m=Nt/gh=8000Вт*60с/9.8м/с2*15м=3200кг

Question

N=A/t=mgh/t
m=Nt/gh=8000Вт*60с/9.8м/с2*15м=3200кг

Answer 1

3200:8000=4
60c/9.8м:2с/15м=30см/2
30см/2:4=30см/2
и 30:2=15