3. What is the potential energy of a 8 Newton book sitting on a shelf that is 12 meters high?

P = 96 J

Explanation:

Given that,

Weight of the book, W = mg = 8 N

It is placed at a height of 12 m

We need to find the potential energy of the book. The potential energy of an object is given by the formula as follows :

E = mgh

mg = Weight

So, the potential energy of the book is 96 J.

b

explanation:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this