2.
A book weighs 6 newtons.
A librarian picks up the book from one shelf and puts it on a shelf 2 metres higher.

(a) Calculate the work done on the book. [Show your working].

(b) The next person to take the book from the shelf accidentally drops it.
The book accelerates at 9.8m/s².
Use this information to calculate the mass of the book. [Show your working].