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A motor boat moves at a steady speed of 4 $ms^{-1}$. Water-resistance acting on it is 4000 N. Calculate the power of its engine. (16 kW)
Solution:
Speed of the boat = v = $4ms^{-1}$
Force = F = 4000 N
Power = P = ?
P = F v
P = $4000 \times 4$
P = 16000 W
P = $16 \times 10^{3}$ W
P = 16 kW