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Force = 400 N

Surface Area = 25 cm²

Now,

Force = thrust   [The force acting normally to the body is called thrust]

∴ Thrust = 400 N

We know,

Pressure = thrust / area

Pressure = 400/ 25 * 10^-4   [Surface area = 10^-4 area]

Pressure = 16 * 10^4 Pascal

Now,

Force = 600 N

Pressure = thrust / area

Pressure = 600/25 * 10^-4

Pressure = 24 * 10^4 Pascal

Hope It Helps YoU!

Answer:

The pressure is given as Force/Area.

In this case, the force is 400 N and the pressure exerted is 20N/cm².

Therefore, Area= Pressure÷Force =400N÷20Ncm²=20cm².

Hence, the area on which the force acts is 20cm².

Hope it's helpful!