Amanda is 8-years old and is learning to function effectively in school. She receives
good grades and generally feels she can be successful at the academic tasks in which she
is involved. According to Erikson, Amanda is likely in the stage of:

Industry vs. Inferiority Stage

Explanation:

Erik Erikson proposed "8 Psychosocial Stages" that people go through from infancy to adulthood.

Among the stages, Amanda's situation shows that she belongs to the stage of "Industry vs. inferiority." This commonly occurs in children between the ages 5 and 12. Here, Amanda knows the importance of going to school and studying. She also knows the value of her teacher in her life. In order to become accepted in the society, Amanda tries her best to be successful in her academic tasks. In this way, she is trying to win the approval of her group of friends or classmates in school. Her good grades reinforced her to study harder.

So, this explains the answer.

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

see below  

explanation:

all of the above