Temperature rise in water falling 100m from a waterfall

[kurtlau]

A waterfall is 100m high and the temperature of the water at the top is 12℃.Assume that all the kinetic energy of the water reaching the bootom is changed into internal energy. Find the temperature of water at the bottom of the waterfall.
I don't know how to calculate~ Help me please and expaining particularly~ Thank you!

 

[Doc Al]

A waterfall is 100m high and the temperature of the water at the top is 12℃.Assume that all the kinetic energy of the water reaching the bootom is changed into internal energy. Find the temperature of water at the bottom of the waterfall.
I don't know how to calculate~ Help me please and expaining particularly~ Thank you!

At the top, the water has gravitational PE = mgh (with respect to the bottom). That PE transforms into KE as it falls. Finally, the KE is transformed into thermal energy. ΔKE = mcΔt, where c is the specific heat of water (look it up!).