I think this is a 2D problem and gravity doesn't come into play (motion are non accelerated). If so,
You can calculate the tan of angle made by straight line joining D and initial position of B with line of length .6 m by dividing .42 with .6
If the tan of angle made by velocity vector of A, after collision with B, is equal to this it will collide with D
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Last edited by Steve; Oct 31st 2015 at 10:08 PM.
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