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  4. A metal ball hits a wall and does not rebound whereas a rubber ball of the same mass on hitting the wall rebounds with the same speed. It can be concluded that

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Q. A metal ball hits a wall and does not rebound whereas a rubber ball of the same mass on hitting the wall rebounds with the same speed. It can be concluded that

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Solution:

Change in momentum of metal ball is $=0-\left(- m v\right)=mv$
Change in momentum of rubber ball is $=mv-\left(- m v\right)=2mv$