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Phy 121
Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Question Form_labelMessages **
Conservation of Momentum lab
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In the space below give in the first line the velocity of the first ball immediately before collision, the velocity of the first ball immediately after collision and the velocity of the second ball immediately after collision, basing your calculations on the time of fall and the mean observed horizontal ranges. In the second line give the before-collision velocities of the first ball based on (mean + standard deviation) and (mean - standard deviation) of its uninterrupted ranges. In the third line do the same for the first ball after collision, and in the fourth line for the second ball after collision.
-------->>>>>>>> velocity first ball before, first ball after, second ball after collision; mean +- std dev first ball before, after, 2d ball after
I do not understand how to get the velocity of the first ball in this question. I got the other two velocities.
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You observed how far the first ball went if it didn't hit the second ball, and how far it went if it did.
So you have the information to calculate its speed before collision, which would be the same as when the second ball wasn't there, as well as its speed after collision.
It's not clear which of these you have calculated, but you should have the information to calculate the other.
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