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A car of mass 1000kg moves at a constant speed of 25m/s along a horizontal road where frictional force is 200N. Calculate the power developed by the engine.

Given,

Mass of car (m)=1000kg
Speed of car (v)=25m/s
Friction force (F)=200N
Power developed (P)=?

Since, speed of car is constant. So, acceleration is zero, i.e a=0m/s2
Total force needed F=Fr+ma
                                 =200+10000=200N
P=Fv=20025=5000Watt

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