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  4. If n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u, then force on surface is

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Q. If $n$ balls hit elastically and normally on a surface per unit time and all balls of mass $m$ are moving with same velocity $u$, then force on surface is

Laws of Motion

Solution:

As collision is elastic, velocity after the collision will be $-u$
So using $F=\frac{d p}{d t}$
$=n(m u-(-m u)$
$=2 n m u$

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