How much work is done if the mass 3.0kg lifted 40 meters?

Answer 1

work is equal to a change in energy. in this case there is a change in potential energy.

potential energy = mass x gravity x height

E(p)=mgh

E(p)= 3x9.8x40

E(p)=1176 J

thus there is a change in potential energy of 1176 joules

and since W=change E(p)

Work done is 1176 J