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N balls per second are thrown on the wall at right angles to it.
mass = m
initial velocity = - u  before hitting the wall, towards the wall
final velocity =  u after hitting the wall and rebounding, away from the wall
Change of momentum of the ball during collision = m u - (-m u)  = 2 m u
  As n balls are hitting the wall in 1 sec,  the total change of momentum of all the balls together in one second  =  2 n m u

       Force = change of momentum per second.

 Force exerted by the wall on all the balls = 2 n m u

  Hence the force experienced by the wall = 2 n m u, as action and reaction forces are equal and opposite in direction.

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