Question

If you exert a force of 45 N to walk 3 m up a flight of stairs in 5 seconds, how much power do you use

Answer 1

Important Formulas:

`w=Fd`

work(measured in joules) = force(measured in newtons) * distance(measured in meters)

`p=(w)/(t)`

power(measured in watts) = work(measured in joules) / time(measured in seconds)

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Given:

`F=45N`

`d=3m`

`t=5s`

`p=?`

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Finding work:

`w=Fd`

`w=45*3`

`w=135J`

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Finding power:

`p=(w)/(t)`

`p=(135)/(5)`

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`\fbox{p = 27 watts}`