- #1

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I got the correct answer, .4237, but it took me hours to get, and now I don't even understand how I got it. I understand all the numbers I used, but I just can't figure out which formulas were used. I basically got it by luck. Here is what I did:

.5(4000)v^2=.5(1700).288^2 + (1700).288(.252) + .5(5200)(.252)

I understand the left side and the first part of the right side, but I don't get why I added (1700).288(.252) + .5(5200)(.252). (I understand what all the numbers are, just not why I used them in that order; especially the 5200). Thank you.