Answer :
Force, F = 550N Area of contact of one shoe = 160 cm2 = 160 x 10-4 m2
Area of contact with two shoes = 160 x 2 = 320 cm2 = 320 x 10-4 m2
(a) If the girl stand on two feet, Pressure = 
= 550/ 320 * 10-4
= 17187.5 N/m2
(b) If she stands on one foot, Pressure = 
= 550/ 160 * 10-4
= 34375 N/m2
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