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A 6000kg rocket is set for vertical firi...

A 6000kg rocket is set for vertical firing. If the exhaust speed is `1000 ms^-1` , the amount of gas that must be ejected per second to supply the thrust needed to overcome the weight of the rocket is (`g=10 ms^-1`)

A

30 kg

B

40 kg

C

50 kg

D

60 kg

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