In which sample water do the water particle have more energy: 5 grams of ice cubes at -10°c or 5 of a liquid water at 20°c?

The answer would be a) -80of

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared.