A station wagon of mass 2000kg has a wheelbase (distance between front and rear axles) of 3.0m. Ordinarily 1100kg rests on the front wheels and 900kg on the rear wheels. A box of mass 200kg is now placed on the tailgate, 1.0m behind the rear axle. How much total weight now rests on the front wheels? On the rear wheels? X=(m1x1 + m2x2 + ...)/(m1 + m2 +...) X=position of centre of mass. Vector sum of torques must be zero. 900kg/2000kgx3m = 1.35m; is the c.m., of the 2000kg car from the front wheels. I cannot think what to do next! Any one any ideas. Many Thanks.