The Boeing 747 begins its takeoff run at time t = 0. The normal forces exerted on its tire...

The Boeing 747 begins its takeoff run at time t = 0. The normal forces exerted on its tires at A and B are NA = 175 kN and NB = 2800 kN. If you assume that these forces are constant and neglect horizontal forces other than the thrust T. how fast is the airplane moving at t = 4 s? (See Active Example 18.1.)