Question

How much work is performed when raise up a book with 1,2kg of the floor to a chair with height equals to 0,7m? g = 9,8m/s^2

Is missing some information, does it?

Answer 1

work done=increase in potential energy=mgh
where m is mass
h is height

Answer 2

So, the work is equals to 8232 -8,2 J ?

Answer 3

1.2*9.8*0.7=8.232 J