Your 'cq_1_21.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A typical automobile coasts up a typically paved incline, stops, and coasts back down to the same position.
• When it reaches this position, is it moving faster, slower or at the same speed as when it began? Explain
The same speed. As the vehicle coasts up the driveway, gravity will cause the vehicle to slow down until it comes to a stop. At which point, gravity will cause the vehicle to coast back down the driveway picking up speed.
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2 min
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I still don't think that I can prove this. I think that I can do it for when it is coasting down the driveway, but not up the driveway. When acceleration due to gravity is in the same direction I can do it. But, I don't know how when it is against gravity.
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For a real-world automobile friction would oppose motion, doing negative work on the automobile and causing a decrease in its KE. It would therefore end up moving more slowly than at the beginning.
Your responses have been reviewed and everything looks good.
Please let me know if you have any questions related to this orientation assignment.