Water falling from a 50 m high fall is to be used


Water falling from a $50 \mathrm{~m}$ high fall is to be used for generating electric energy. If $1.8 \times 10^{5} \mathrm{~kg}$ of water falls per hour and half the gravitational potential energy can be converted into electric energy, how many $100 \mathrm{~W}$ lamps can be lit.


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