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@Michele_Laino please can you solve it?

okay so work is Fd so the answer is 2450 N times 50 m

wait... per second

ignore my last answer

I think you're right because a watt is a N-m/s, so the units work out

|dw:1434218860993:dw|

|dw:1434218975568:dw|

so:
\[\frac{{\Delta p}}{\gamma } = 5 \times 10.33 = 51.65\;meters\]

please keep in mind that 10.33 meters is the maximum aspiration height for a pump

and:
1 athmosphere is equivalent to 10.33 meters of water

so you think that 2.45*10^5 would be the correct option?

yes!

are you confirmed liano?

.
i'd go with d) but i'd like the OP to post the answer when that becomes apparent

yes! I confirm my answer above!

i asked this to my friend he say to me that you can apply formula
\[P=mgh/t\]
since W=mgh
\[P=W/t\]

so after this answer is none of these,the (d) option

i am so much confused about the answer,but i think what you are telling is also correct!