Explain Work, Energy and Power

Numbnut247
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Hey guys, do you know a good website that explains Work, Energy and Power for High School Physics Thanks
 
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Here's an excellent high school physics tutorial: http://www.physicsclassroom.com/Class/energy/energtoc.html
 
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Thread 'Average velocity as a weighted mean'

Hello everyone, Consider the problem in which a car is told to travel at 30 km/h for L kilometers and then at 60 km/h for another L kilometers. Next, you are asked to determine the average speed. My question is: although we know that the average speed in this case is the harmonic mean of the two speeds, is it also possible to state that the average speed over this 2L-kilometer stretch can be obtained as a weighted average of the two speeds? Best regards, DaTario
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