A disk of mass 200 g is kept floating horizontally in air by firing bullets of mass 20 g each vertically at it at a rate 10 per second. The bullets rebound with the same speed. Find the speed with which bullets were fired.

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A disk of mass 200 g is kept floating horizontally in air by firing bullets of mass 20 g each vertically at it at a rate 10 per second. The bullets rebound with the same speed. Find the speed with which bullets were fired.