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anonymous
 one year ago
Which of these follows from Newton's laws about the energy of a moving object?
anonymous
 one year ago
Which of these follows from Newton's laws about the energy of a moving object?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A. The mechanical energy remains the same if there are only conservative forces acting B. The total of all forms of energy is always constant C. the kinetic energy of an object remains the same if friction is absent D. the total mechanical energy of an object is always constant

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I think the first option, since we can write the subsequent chain of equalities, for a free falling particle whose mass is m: \[PE = mgh = mg\frac{1}{2}g{t^2} = \frac{1}{2}m{\left( {gt} \right)^2} = \frac{1}{2}m{v^2} = KE\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1keep in mind that gravitational force, is a conservative force

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohh okay!!! thank you:)
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