A 50 gram piece of cake is dragged across a 2meter long strip of sandpaper, losing about half of its

A 50 gram piece of cake is dragged across a 2meter long strip of sandpaper, losing about half of its mass by the time it reaches the end of the strip. Only just enough force is applied to the cake to keep it moving. How much was done in moving the cake? (Take g=10m/s2and the coefficient of friction for the cake on a sandpaper to be 0.8).

 

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