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A book weighs ##6.0## ##N##. If the acceleration of gravity is ##9.8## ##m####/####s^2##, what is the mass of the book in kilograms?
##0.61"kg"##
The weight of the book is equal to ##mg##.
So:
##6=mxx9.8##
##:.m=6/9.8=0.61"kg"##