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Ball to Ball Collision - Detection and Handling
...s, the new velocities can be calculated using the equations (where v1 and v2 are the velocities after the collision, and u1, u2 are from before):
If the balls have the same mass then the velocities are simply switched. Here's some code I wrote which does something similar:
void Simulation::c...
How do I remove the old history from a git repository?
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Just create a graft of the parent of your new root commit to no parent (or to an empty commit, ...
center aligning a fixed position div
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Koen's answer doesn't exactly centers the element.
The proper way is to use CCS3 transform pr...
How to launch an Activity from another Application in Android
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How to add new elements to an array?
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edited Feb 13 '13 at 5:26
Paul Bellora
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Error in : object of type 'closure' is not subsettable
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In general this error message means that you have tried to use indexing on a function. You can...
SQL (MySQL) vs NoSQL (CouchDB) [closed]
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edited Feb 20 '15 at 21:05
community wiki
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Most common way of writing a HTML table with vertical headers?
...s must contain the same number of columns." - Last paragraph of section 11.2.3.
With that being said, the first option is the better approach in my opinion because it's readable regardless of whether or not I have CSS enabled. Some browsers (or search engine crawlers) don't do CSS and as such, it'l...
导盲项目：什么场景非得用相机预览？按杖上按钮或定时拍照，识别后语音提醒...
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