44. * A person is pushing two carts that are connected with a metal bar so that the carts are moving at constant acceleration 0.2 m/s*. The masses of the carts are 100 kg and 180 kg, and the mass of the connecting bar is 60 kg. Determine (a) the force that the bar exerts on the smaller cart and (b) the force that the bigger cart exerts on the bar. Assume that the friction forces are negligible