i dont know how to do a score board or have the hoop move from side to side to make it harder to score in. Plus how do you make the hoop and basketball collide?? ill add a picture of my user interface and my one blocks.
See
http://www.appinventor.org/bookChapters/chapter17.pdf
from
http://www.appinventor.org/book2
from
Do you need gravity for your basketball?
If so, you will need a Clock Timer to adjust its Speed and Heading.
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Also factor in that you may not want the ball to collide with the basket/hoop on the way up but only on the way down 
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