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P=12kW=12000W
W=30J
t=?
P=W/t/×t
P×t=W/:P
t=W/P
t=30/12000s=1/400s
2.
F=500N
S=60km
t=2h
P=?
p=W/t
W=F×S
W=500×60=30000J
P=30000/2=15000W=15kW