A 600 kg rocket is set for vertical firi...

A 600 kg rocket is set for vertical firing. If the exhaust speed is 1000m/s, the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is

`117.6 kgs^(-1)`

`58.6 kgs^(-1)`

`6 kgs^(-1)`

`76.4 kgs^(-1)`

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