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A 5000 kg rocket is set of vertical firi...

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