## In This post you will get answer of Q.

$10000$ small balls, each weighing $1g$ strike one square centimetre of area per second with a velocity $100, m/s$ in a normal direction and rebound with the same velocity. The value of pressure on the surface will be

Solution:

## $P = frac{F}{A} = frac{ n , mv – – mv}{A} = frac{2 m n v}{A}$

$ = frac{2 times 10^{-3} times 10^4 times 10^2}{10^{-4}}= 2 times 10^7 , N /m^2$