Determine the change in the momentum of the ball, Physics

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A girl throws a 0.1 kilogram ball at a wall. 

The ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces straight back with a velocity of 4 meters per second. 

The change in the momentum of the ball is:

 

Ans - 0.9 Kilogram-meters per second

 


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