Answer:
Work done in both the cases will be same
Explanation:
As we know that the work done against gravity is given as

here we know that gravitational force is a conservative force and the work done against gravitational force is independent of the path
So here the work done by person to move the object between two different heights will be independent of the path they choose
So for the first person and second person will be same in both the cases because the height through which the boxes are transferred will be same in both the cases
It must have a medium. It must travel in empty space. Mechanical waves are waves which needs medium of propogation.
Answer: Waning
Explanation: Not much explanation for this
Just remember
Voltage = current times resistance
current = voltage over resistance
Current = 9/3 = 3
The answer they are looking for is the last one. However the last two are technically correct but the third one would result in negative work.