The ball will be a touchback when it crosses the goal line since it's a touchback regardless of who put the force on it. In a) the basic spot is the 20 but the bat happened at the 5 so the spot of the foul is behind the basic spot and it will be R's ball at the 2 1/2. In b) it's simply a touchback unless the bat was so flagrant that you'd call it unsportsmanlike conduct, in which case it's enforced from the succeeding spot, the 20.
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