which of the following statements about the bounce A very elastic rubber ball is
ID: 2076113 • Letter: W
Question
which of the following statements about the bounce A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward. Which of the following statements about the bounce are correct? (There could be more than one correct choice.) The magnitude of the ball's momentum was the same just before and just after the bounce. The ball had the same momentum just before and just after the bounce. The ball's momentum was conserved during the bounce. None of the above statements are correct.Explanation / Answer
According to the given problem,
A is correct. As the speed is the same and the mass is the same then the MAGNITUDE ( = mv) is also the same.
The reason why B and C are false is that the DIRECTION of the momentum has altered.
Now you presumably know that momentum OF A SYSTEM is conserved. But the system includes more than just the ball. The earth is a part of the system.
The ball can have a different momentum as long as that change is transferred to the earth.
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