Question

If a strong man lifts a barbell with a mass of 125.7 g and does 5023 joules of work, how high did he lift it?

Answer 1

The equation for gravitational potential energy is:

`DeltaE_(g)=mgDeltaH`

Therefore,

`DeltaH=(DeltaE_g)/(mg)`

`DeltaE_(g)=5023 J`
`m=125.7 g=0.1257 kg`
`g=10`

`DeltaH=5023/(0.1257xx10)=4000 m`