Answer :

Given:


Mass of blocks:10kg and 20kg


Speeds of blocks:10m/s and 20m/s


Formula used:


Momentum=mv


M=mass


V=velocity


Conserving momentum


Momentum initial=momentum final


10× 10-20×20=30× final velocity


Final velocity=10m/s


Thermal energy=change in kinetic energi



Thermal energy=3000J


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