Answer:
Work done, W = 6 J
Explanation:
It is given that,
Force of gravity acting on the book, weight of the book is 15 N
We need to find the work done in lifting the book straight up for a distance of 0.4 meters.
The weight of the book is acting in downward direction and the book is lifted straight up, it means angle between them is 180 degrees. Work done is given by :
[tex]W=Fd\cos180\\\\W=15\times 0.4\times \cos180\\\\W=-6\ J[/tex]
So, the magnitude of work done in lifting the book is 6 joules.
