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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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200 mvt

mv/100t

100mv/t

200mv/t

answer is D.

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Detailed Solution

$ΔP = 100 \times 2 mV ∴ F = \frac{ΔP}{Δt} = \frac{200 mV}{t}$

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