Does it require more work to raise a 15 kg block by 4 m or to raise a 20 kg block by 2 m, if both are moving at
a constant velocity? Draw a free-body diagram to help
solve the problem.

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.