Assertion: n small balls each of mass m colli | vedclass

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(A) In an elastic collision,kinetic energy is conserved,therefore the ball rebounds with the same velocity $u$ in the opposite direction.According to

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If both $Assertion$ and $Reason$ are correct and the $Reason$ is a correct explanation of the $Assertion$.

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(A) In an elastic collision,kinetic energy is conserved,therefore the ball rebounds with the same velocity $u$ in the opposite direction.According to Newton's second law,the force $F$ exerted by the surface is equal to the rate of change of momentum.The change in momentum for one ball is $\Delta p = m(u - (-u)) = 2mu$.Since $n$ balls collide per second,the total change in momentum per second is $n 	imes 2mu = 2mnu$.Therefore,the force experienced by the surface is $F = 2mnu$.Both the $Assertion$ and $Reason$ are correct,and the $Reason$ explains why the change in momentum is $2mu$ per ball.

$Assertion$: $n$ small balls each of mass $m$ collide elastically each second on a surface with velocity $u$. The force experienced by the surface is $2mnu$.
$Reason$: On elastic collision,the ball rebounds with the same velocity.

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$Assertion$: $n$ small balls each of mass $m$ collide elastically each second on a surface with velocity $u$. The force experienced by the surface is $2mnu$.$Reason$: On elastic collision,the ball rebounds with the same velocity.