A person falls flat on their back on some slippery ice and isunconscious for a second. The horizontal position of their legstorso and head from their feet is given by 0.3 m, 0.98 m and 1.74 mrespectively and their weights are 30 kg 50 kg and 10 kg. They tryto sit up on the ice which is so slippery they are not able to movetheir horizontal centre of mass. The new positions of their legs,torso and head from their feet are 0.21 m, 0.54 m and 0.73 m. Whatis the magnitude of the change in position of the person'sfeet?