Correlation tells us that two traits or behaviors are related to one another, but it does not prove
a.) that your control group has been randomly selected
b.) that one trait or behavior caused the other
c.) that your study was replicated
d.) that your results can now be generalized

B; that one trait of behavior caused the other

Explanation:

If we look at this from a statistical perspective, we know that correlation does not necessarily indicate causation. Although certain behaviors may be related with each other, it does not mean that those same traits were the cause to the behaviors of another trait. To give an example, both crime and the sales of ice cream increase during the summer every year, but does ice cream cause crime or vice versa? In fact, the answer is neither. In fact, crime during the summer is attributed to the fact that families tend to take more vacations during the summer. Although they were related, there was no evidence to prove that one caused the other (causation). Do not confuse correlation with causation, it just indicates a sort of relationship, but not a reason for why it is (correlation doesn't prove causation).

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