Question

If you perform 10 joules of work lifting a 10-N box from the floor to a shelf, how high is the shelf?

Answer 1

mgh= energy / work
mgh=10

(10) h=10
h=1

Answer 2

I think that the box needs to be in kg not in Newtons

Answer 3

mg is the weight of box and that is equal to 10N, so as she has done above
m*g*h= P.E
10*h= 10
h=1 m
height is 1m