Chapter 6. Conservation of mechanical energy (6-23)

Question

lXazFIJws+JtMHteBxxx5Xow3gI4o5cn6eivkXcb2q9SPFakyREuBf+Na4zpXbgy0UzY2F4fJG2NknbocBlUP/3GCeNbFV8qik/ElBkvvfclOECdVJTlNfLz81jNwl+G+fArbr2PUzxKzV27

{"title":"VaValues of the kinetic energy K of an object at two points (i and f) during its motion","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"2,2,35,40\"},{\"shape\":\"rect\",\"coords\":\"176,4,211,38\"}]"} {"title":"Values of the potential energy U at the same two points","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"81,5,117,40\"},{\"shape\":\"rect\",\"coords\":\"258,5,296,40\"}]"}

Question

/oKIfyKEbVq11INyzCT5Bj03mdpvPWpBryDxUdrLL+ge1ZJujMGEtya2+VzGeOIYLaGAIwlVJHh0G+qmkODyaGSK0IxQDOne0RwW/w==

{"title":"VaValues of the kinetic energy K of an object at two points (i and f) during its motion","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"2,2,35,40\"},{\"shape\":\"rect\",\"coords\":\"176,4,211,38\"}]"} {"title":"Values of the potential energy U at the same two points","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"81,5,117,40\"},{\"shape\":\"rect\",\"coords\":\"258,5,296,40\"}]"}

Review

You can see that this is a more general form of Equation 6-21, which refers to the case in which only one conservative force— the gravitational force—does work. Note that we can take the initial point i and the final point f to be \(\textit{any}\) two points during the motion, as long as only conservative forces do work.