This second stroke drill is a little more difficult and is the ultimate test of your stroke.
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Refer to the diagram above. Arrange the balls as shown. Place an object ball on the rail on the second diamond from the top right corner pocket, then place the cue ball on the same vertical line from the object ball.
Proceed by shooting at the object ball. You should aim at the cue ball without any english or spin. Aim at the exact center of the object ball. Similar to the Stroke Drill #1, the cue ball should go back in a straight line towards the position it started from.
In this drill, any error that you may have in your stroke that did not show in the first stroke drill would surely show here. Since you are hitting another ball which is round... unless the cue ball hits the object ball dead center, the cue ball will not come back in a straight line. Try it and you'll see what I'm talking about.
Practice this drill until you are able to execute it correctly about 80-100% accuracy.