100 balls each of mass m moving with speed v simultaneously strike a wall normally and reflected back with same speed, in time t s . The total force exerted by the balls on the wall is

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. Force exerted by each ball is F = ∆ p ∆ t , here, p is momentum and t is time. So, for one ball F = m v - m - v t = 2 m v t Now, total force exerted by the balls on the wall is F n e t = 100 × F = 200 m v t .

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