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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:
a) 0.1 kilogram-meters per second
b) 0.4 kilogram-meters per second
c) 0.5 kilogram-meters per second
d) 0.9 kilogram-meters per second
Ans:
The change in the momentum of the ball is 0.9 kilogram-meters per second.
The time needed for a net force of 10 newtons to change the velocity of a 5 kilograms mass by 3 meters/second is: a) 1.5 seconds b) 6 seconds c) 16.7 seconds d
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