A disc of mass \( 1.0 \mathrm{~kg} \) is kept floating horizontally in air by firing bullets of ...

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A disc of mass \( 1.0 \mathrm{~kg} \) is kept floating horizontally in air by firing bullets of mass \( 0.05 \mathrm{~kg} \) each vertically at it, at the rate of 10 per second. If the bullets rebound with the same speed, the speed with which these are fired will be-
(1) \( 0.098 \mathrm{~m} / \mathrm{s} \)
(2) \( 0.98 \mathrm{~m} / \mathrm{s} \)
(3) \( 9.8 \mathrm{~m} / \mathrm{s} \)
(4) \( 98.0 \mathrm{~m} / \mathrm{s} \)
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