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W=30J
P=W/t
12000=30/t
12000t=30
t=0,0025 s
W=30J
P=W/t
12000=30/t
12000t=30
t=0,0025 s
2.F=500N
s=60km=60000m
t=2h=120min=7200s
W=F x s
W=500 x 60000
W=30000000J
P=W/t
P=30000000/7200
P~4200W