Question

What is the potential energy of a 2.5 kg book held 2.0 m above the ground?

Answer 1

`49J` of energy

Explanation:

Formula for potential energy:
`P.E=mgh`
`m =` mass(`kg`)
`g =` gravity(`m`/`s^2`)
`h =` height/distance(`m`)

What is given to you? Well the book is held from the ground of a distance `2.0m`, so `h=2.0m`. Next we know that the book weighs `2.5kg`, so `m=2.5kg`.

Now we just put it in the formula:
`PE=(2.5kg)xx(9.8m`/`s^2)xx(2.0m)`
`PE=49J`