3. The mass of Aimi is 47kg. She wears a pair of high-heeled shoes, each with a surface area of contact of 1.5cm with the floor. What is the pressure exerted by Aimi on the floor?
4. The mass of a car is 1000kg. If the area of contact between the tyres and the road surface is 25cm^2,calculate the pressure exerted by each tyre on the surface of the road.