23) G

It is important to remember that power = energy per second.

Potential energy (PE) of water when it reaches a height of 5m = m x g x h

PE = 5 x 10 x 5 = 250J

This is the energy of 5kg of water which is released per second.

Hence, power = 250 J/s or 250 W

We know that all kinetic energy is converted to potential energy when it reaches a height.

Therefore PE = KE = 250 J

KE = ½mv²

250 = 0.5 x 5 x v²

100 = v²

v = 10 m/s

Hence the answer is G.

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