A 5000 kg rocket is set for vertical firing. The exhaust speed is `800 m s^(-1)`. To give an initial upward acceleration of `20 m s^(-2)`, the amount of gas ejected per second to supply the needed thrust will be (`g=10 m s^(-2)`)

Options

A. `127.5 kg s^(-1)`
B. `137.5 kg s^(-1)`
C. `155.5 kg s^(-1)`
D. `187.5 kg s^(-1)`