Asimple index of three stocks opens the day with these values the index rises 4.9% over the course of the day. what is the value of the index at the end of the day? round your answer to the nearest hundred. a- $70,400 b- $68,300 c- $67,100 d- $68,700

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ek = (m.v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) v2/2

ek = (200 + 250) 2,32/2 = 450*5,29/2 = 1190,25 j

by: nicholas dooley