Advanced Problem 2

[wail_poet]

acceleration doesn't change (gravity)
because it is the factor that decreases velocity while it is going up .... and the factor that increases the velocity by the same amount 9.8 while falling down

for circular motion ofcourse there is acceleration but special one which changes velocity in direction not value
any change in value - direction or both requres acceleration done from exestance of external force
thank you all