What is the pressure exerted by a boy

weighing 80kg on the ground when he stands

on his feet whose area is 200cm2?

A. 80 pa

B. 1600 pa

C. 40,000 pa

D. 400 pa

The answer is C. 40,000 pa

Explanation:

Given

Mass (m) = 80 kg

Area (A) = 200 cm^2

= 0.02 m^2

g = 10 m/s^2

First calculating Force (F)

= m * g

= 80 * 10

= 800 N

Now

Pressure (P) = F / A

= 800/0.02

= 40,000 pa