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  4. A disc of mass 1.0 kg kept floating horizontally in air by firing bullets of mass 0.05 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-

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Q. A disc of mass $1.0 \,kg$ kept floating horizontally in air by firing bullets of mass $0.05\, kg$ 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-Physics Question Image

Laws of Motion

Solution:

$F=\frac{\Delta p}{\Delta t}=M g $
$\Rightarrow 2 m n v=M g$
$\Rightarrow v=\frac{1 \times 9.8}{2(0.05)(10)}$
$=9.8\, m / s$