A plane passes over Point A with a velocity of 8,000m/s North. 40 seconds later it passes over Point B with a velocity of 10,000 m/s North. What is the planes’ acceleration from A to B?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.