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Rate of doing work or rate of energy transfer
P=FdtP = \frac{Fd}{t}P=tFd
P=FvP = FvP=Fv
Watt (WWW)
1 W=1 J/s1 \, \text{W} = 1 \, \text{J/s}1W=1J/s
1 kW=1000 W1 \, \text{kW} = 1000 \, \text{W}1kW=1000W
At constant speed, tractive force equals resistance force
F=PvF = \frac{P}{v}F=vP
a=Fnetma = \frac{F_{\text{net}}}{m}a=mFnet
Fnet=Ftract−FresF_{\text{net}} = F_{\text{tract}} - F_{\text{res}}Fnet=Ftract−Fres
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