A car weighing 1400kg accelerates from 90 km/hr to 110 km/hr in 6.0s.
a) assuming no friction, what was the power output of the car?
b) If a frictional force of 700 N acted on the car over a distance of 400 m during the same 6.0-second acceleration, what would be the power output of the car if the same speed increase was observed?

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Figure out it's change in kinetic energy.

You have the mass and two velocities. So calculate the kinetic energy before and after acceleration.

Power is just going to be energy / time

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