Answer :

Given:


Mass of van=1500kg


Speed=15m/s


Time taken to stop=10s


Formula used:


Mechanical energy=kinetic energi=1/2mv2


M=mass


V=velocity


So


Kinetic energy=1/2× 1500×225=168750J


Average rate of production of thermal energi=energy produced /time


=168750/10 J/s


=4017.8 cal/s


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