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A boy takes to lift a book of mass from the top of a desk and place it on a shelf. The top of the desk is above the floor, and the shelf is above the floor. The gravitational field strength is .
Which power does the boy develop?
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to lift a book of mass 
from the top of a desk and place it on a shelf. The top of the desk is 
above the floor, and the shelf is 
above the floor. The gravitational field strength is 
.
. (Option C)
