Question

Question #d93a0

Answer 1

I got: `1.4xx10^7W`

Explanation:

Consider that power is the rate of energy "consuption/use" with time.
To raise our body we need to supply an energy equal to the Gravitational Potential Energy stored in reaching an height of `24m` against the action of gravity:
`U=mgh`
i.e. we need to overcome, at least, the gravitational force (Weight) of the body.

We get:

`U=mgh=30xx10^3*24*9.81=7,063,200~~7xx10^6J`

The Power will then be:
`"Power"="Energy"/"time"=(7xx10^6)/0.5=1.4xx10^7W`