This tire may be considered a ring with 20in outside diameter and 16in inside diameter weighing 10lb.  The boy pushes on the tire horizontally an inch below the top of the tire with a force of 2.Delta.DeltaDeltaDelta+0.1t pounds force for 5 seconds.  The force between the grass lawn and the tire is unknowable, but by 5 seconds the tire is rolling without slipping.  Determine the velocity of the tire to the left after 5 seconds of pushing.  The tire starts from rest.