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PersonWhoNeedsHelp

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Which of the following statements about a lunar eclipse is true?A: A lunar eclipse can occur when the moon is in any phase B: A
1. 5 answers
2. 5,690 views
A proton, moving with a velocity of vi, collides elastically with another proton that is initially at rest. Assuming that after
1. 1 answer
2. 1,370 views
Jonathan is riding a bicycle and encounters a hill of height 6.70 m. At the base of the hill, he is traveling at 5.00 m/s. When
1. 3 answers
2. 3,709 views
A proton, moving with a velocity of vi, collides elastically with another proton that is initially at rest. Assuming that after
1. 4 answers
2. 3,308 views

Ok, thanks!!!
I think it's B
I do not know how to solve this. I tried.
I'm still confused why the answer is -5100 Joules for part B when I got it wrong with -5095.2 Joules.

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