Answer :

Given:


Speed of man:5m/s


ΔT=10C


Mass of man=50kg


Formula used:


Kinetic energy =1/2 mv2


ΔQ=MCΔT


ΔQ=heat exchange


ΔT=tempeature change


M=mass


C=heat capacity


Kinetic energy of person = heat absorbed by the water


625=M× 4200× (30-20)


M=0.01488kg


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