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A 5000 kg rocket is set for vertical fir...

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

A

`185.5 kg s^(-1)`

B

`187.5 kg s^(-1)`

C

`127.5 kg s^(-1) `

D

`137.5 kg s^(-1)`

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