Two bowling balls are at rest on top of a uniform wooden plank with their centers of mass located as in the figure below. The plank has a mass of 4.50 kg and is 1.00 m long. Find the horizontal distance (in m) from the left end of the plank to the center of mass of the plank-bowling balls system. HINT 0.810 m 0.240 m 4.05 kg 6.40 kg B 4.50 kg 1.00 m m