A Worker Lifts a 20

question 54

Multiple Choice

A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building.The bucket is initially at rest,but is traveling at 4.0 m/s when it reaches the top of the building.What is the minimum amount of work that the worker did in lifting the bucket?

• A) 3.92 kJ
• B) 400 J
• C) 560 J
• D) 4.08 kJ
• E) 160 J