A 25000 Kg airplane takes off from rest and reaches 5000m altitude and cruises at 900km/h in 8 minutes .Find Avg Power ?

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A 25000 Kg airplane takes off from rest and reaches 5000m altitude and cruises at 900km/h in 8 minutes .Find Avg Power ?

Physics
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My Work: Pavg = W/t W = Delta K.E W = 25000 * 250*250 / 2 t = 8 * 60
i got Pavg = 1.6 MW but the answer shuld be 4.2 MW
Hang on a bit...

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Other answers:

You have forgotten the gain in gravitational potential energy.
We have Consider P.E here ?
Of course! How could you raise the altitude of the plane without providing energy?!
Yup...i got..it...thx..)
but @Vincent-Lyon.Fr we knw change in K.E is Work Done..Why cant we Use it here..)
Is it then mgh+delta K.E /t ?
You can, but there are two works to take into account: - motive work by the engine (positive) - negative work by the weight so change in KE = Wengine - Mgh or W engine = change in KE + change in PE
Ok...Thxx....
yw :)
I see you are now getting to the energy concept. Soon you will be able to solve problems of mechanics by this method.

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