Why can I say that air drag is a negative force
2 answers:
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The average power is 20.3 kW
Explanation:
First of all, we calculate the work done on the car: the work-energy theorem states that the work done on the car is equal to the change in kinetic energy of the car, so we have
where
W is the work done
are the initial and final kinetic energy of the car
is the mass of the car
u = 0 is the initial velocity
v = 18.0 m/s is the final velocity
Substituting,
Now we can find the average power developed by the car's engine, which is given by
where
is the work done
t = 12.0 s is the time taken
Substituting,
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