$10,000 $ small balls, each weighing $1\, gm$, strike one square cm 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
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(d) $P = \frac{F}{A} = \frac{{n[mv - ( - mv)]}}{A} = \frac{{2mnv}}{A}$
$ = \frac{{2 \times {{10}^{ - 3}} \times {{10}^4} \times {{10}^2}}}{{{{10}^{ - 4}}}}$
$ = 2 \times {10^7}N/{m^2}$
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