an 5kg object speed up from 5m/s(point A) to 10m/s(point B)
at point A, the energy is 0.5mv2 = 0.5(5)(5)2 = 62.5J
at point B, the energy is 0.5mv2 = 0.5(5)(10)2 = 250J
I don't not sure why the energy in the object is increased when it speeds up from point A to point B. suppose the energy in the object should be taken up to increase it's speed isn't?
or my concept is wrong?