Easy bio a person is standing on a level floor. his head, upper torso, arms, and hands together weigh 438 n and have a center of gravity that is 1.28 m above the floor. his upper legs weigh 144 n and have a center of gravity that is 0.760 m above the floor. finally, his lower legs and feet together weigh 87 n and have a center of gravity that is 0.250 m above the floor. relative to the floor, find the location of the center of gravity for his entire body.