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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 `m//s`. 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 (Take `g = 10 m//s^(2)`)

A

127.5` kg//s`

B

137.5 `kg//g`

C

155.5`kg//g`

D

187.5 `kg//s`

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