Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg ...

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Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is
 
  A) twice as much as the 25-kg sack.
  B) half as much as the 25-kg sack.
  C) the same.
  D) need more information

Question 2

The center of a long uniform log is raised to shoulder level while the other end is on the ground. If instead, the end of the log is raised to shoulder level, the work required is
 
  A) half.
  B) the same.
  C) twice.

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Answer to Question 1

Answer: C

Answer to Question 2

Answer: A