A 6000 - kg rocket is set for firing . I...

A 6000 - kg rocket is set for firing . If the exhaust speed is `1000 ms^(-1)` , how much gas must be ejected per second to supply the thrust needed , (a) to overcome the weight of the rocket , (b) to give the rocket an initial acceleration of `19.6 ms^(-2)`?

30 kg

60 kg

75 kg

90 kg

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