Power is the rate of doing work and can be calculated using the formula:
where WD is the work done by the driving force in joules and is the time in seconds.
A vehicle drives along a straight, horizontal road for 10 seconds, the work done by the engine is 75000 J. All resistance forces can be ignored.
Calculate the power developed by the engine of the car, giving your answer in joules per second.
Power is measured in watts (W) where 1 watt is 1 joule per second or in kilowatts (kW) where 1kW= 1000 w.
Write your answer to part (a) in:
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