| http://www.w3.org/ns/prov#value | - When a speed is 20 m/s, a kinetic energy=40 J, a potential energy=0 J, so a dynamic energy of this object is 40 J. When the speed is a half, a kinetic energy=0.5???0.2???(10)2=10 J. A dynamic energy 40=a kinetic energy+a potential energy so, at this time, a potential energy is 30 J. Example is 10 J and right answer is 30 J, so it is correct answer. 5) In any points, a dynamic energy is same.
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