If you calculate for a quarter-inch-diameter steel ball bearing, you can calculate r, you will find that the critical velocity is about 100 miles per hour, and we know very well there is no way when you drop a quarter-inch ball bearing into this syrup that it's going to come anywhere near that, so the speed will remain way below 100 miles per hour, and therefore this is a term that will dominate and this term can be completely ignored. 