A pump is to lift 16.0 kg of water per minute through a height of 3.38 m. What output rating (watts) should the pump motor have?(adsbygoogle = window.adsbygoogle || []).push({});

Potential Energy Initial = O

Kenetic Energy Final = 0

So,

KE-PE = W

1/2mv^2 - mgh = Work

1/2(16.0)(3.38)^2 - (16.0)(9.8)(3.38) = -439 W

The fact that my answer is negative automatically tells me that I did something wrong as the pump wouldn't have a negative output. Does anyone see where I went wrong?

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# Homework Help: Watts as opposed to Joules?

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