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
Answer:C
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