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

Options

A. `100 ms^(-1)`
B. `200 ms^(-1)`
C. `50 ms^(-1)`
D. `10 ms^(-1)`

Answer

C