Question

A girl of mass 45 kg whose feet covered 150cm^2 on ground. find the pressure on ground.

Answer 1

Given that :

• Mass of a girl = 45 kg
• Feet covered = 150 ${cm}^{2}$,A = ${10}^{-7}$${m}^{2}$

Need to find:

• Pressure on ground = ?

Solution:

The formula of pressure on ground is —

${\qquad}{ \bigstar{ \boxed{ \sf{p = \frac{f}{a}}}}}$

According to the question —

$\sf \implies \: p = \frac{40}{ {10}^{ - 7} } \\ \\ \sf \implies \: p = 4 \times {10}^{8} \frac{n}{ {m}^{2} }$

Hence,the Pressure on ground is 4 $\times$ 10^8 N/m^2.