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well, i think that what you did is not selfish and iam sure he wouldnot blame you for doing so but i think he would blame himself a little, only if he is not giving his daugter the great attention that he thinks she should be given. you really dont have alot to do about it . finally... not putting his daugter picture in the frame is not selfish but putting it another time would be very kind and effective

no surely not, why? all living things (al least on earth) are living because their cells are living (known that cells dry and die without water)http://en.wikipedia.org/wiki/Cell_(biology)
so without living cells no living things

in the law point of view yes because no one has the right to prevent a parent from seing (his,her)children even if this one is the other parent but if the childern are in danger(which can be proven) with one of the parents then they can be taken away by the other one by the law it self

its an unsolvable equation because (b^2-4ac) is a minus number so it is not solvable in real numbers but you can find a solution using the imaginary numbers and it is (14 +or- i51.225)

actually because Its peak of throw is about 10 metres in the air and The ball is thrown in a perfect circle then it will never go back for him because it will strike the ground before it can get back to him so the solution will appear when putting t1=t2 then(d1/v1)=(d2/v2)
d1=1/2πr(quarter of a circle)r=10 ,v1= 62 ,d2=10 meters, then you can get the last variable v2 dont forget the units :)