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

Q. A disk of mass 1 kg is kept floating horizontally in air by firing bullet of mass 0.5 kg each vertically at it, at the rate of 10 per second. If the bullets rebounded with the same speed, the speed with which these are fired will be then

Q. A disc of mass $5kg$ is kept floating horizontally in mid air by firing $10$ bullets per second vertically up. If the mass of each bullet is $50gm$ and bullets rebound with same speed, the speed of each bullets is $(g=10{ms}^2)$

Q. A disc of mass $100g$ is kept floating horizontally in the air by firing bullets each of mass $5g$ with the same velocity at the same rate of $10$ bullets per second. The bullets rebound at the same speed in opposite direction. Then, the velocity of each bullet at the time of impact is: (Take $g=10m/s^2)$

Q. A dish of mass $100gm$ is kept horizontally in air by firing bullets of mass $5g$ each at the rate of $10$ per second. If the bullets rebound with the same speed, what is the velocity with which the bullets are fired?

Q. 5 bullets, each of mass 10 gm are fired per second, vertically upwards, such that a plate of mass 200 gm floats in air. If the bullets rebound with the same velocity back vertically downwards, the velocity with which each bullet is fired in ms${}^{-1}$ is:
(Take $g=10m{s}^{-2}$)