If n balls hit elastically and normally on a | vedclass

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Question

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

Vedclass · Accepted Answer

$2 \,mun$

Vedclass · Answer

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

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 ..........